diff --git a/README/WHATS_NEW_zh-CN.md b/README/WHATS_NEW_zh-CN.md
index 4915c9b3..8e404b1b 100644
--- a/README/WHATS_NEW_zh-CN.md
+++ b/README/WHATS_NEW_zh-CN.md
@@ -1,5 +1,11 @@
 # 本次更新 — AutoControl
 
+## 本次更新 (2026-06-23) — 窗口 Z-order(置顶 / 最前 / 最后)
+
+把窗口钉在最上层、移到最前、或推到后面。完整参考:[`docs/source/Zh/doc/new_features/v147_features_doc.rst`](../docs/source/Zh/doc/new_features/v147_features_doc.rst)。
+
+- **`set_topmost` / `bring_to_front` / `send_to_back` / `plan_zorder`**(`AC_set_topmost`、`AC_bring_to_front`、`AC_send_to_back`):原始 `set_window_position` 存在但未在 facade、无标题包装也无 topmost 语意——缺少标准 RPA 的「置顶」。`plan_zorder` 是纯动作→`SetWindowPos` 常数查找(可无头测试);以标题操作的设定器透过可注入 driver(`snap_window` 接缝模式)套用,默认为 Win32。
+
 ## 本次更新 (2026-06-23) — 局部动态 / 活动检测
 
 找出两帧之间哪些子区域在动。完整参考:[`docs/source/Zh/doc/new_features/v146_features_doc.rst`](../docs/source/Zh/doc/new_features/v146_features_doc.rst)。
diff --git a/README/WHATS_NEW_zh-TW.md b/README/WHATS_NEW_zh-TW.md
index 947b52cd..2b99f10d 100644
--- a/README/WHATS_NEW_zh-TW.md
+++ b/README/WHATS_NEW_zh-TW.md
@@ -1,5 +1,11 @@
 # 本次更新 — AutoControl
 
+## 本次更新 (2026-06-23) — 視窗 Z-order(置頂 / 最前 / 最後)
+
+把視窗釘在最上層、移到最前、或推到後面。完整參考:[`docs/source/Zh/doc/new_features/v147_features_doc.rst`](../docs/source/Zh/doc/new_features/v147_features_doc.rst)。
+
+- **`set_topmost` / `bring_to_front` / `send_to_back` / `plan_zorder`**(`AC_set_topmost`、`AC_bring_to_front`、`AC_send_to_back`):原始 `set_window_position` 存在但未在 facade、無標題包裝也無 topmost 語意——缺少標準 RPA 的「置頂」。`plan_zorder` 是純動作→`SetWindowPos` 常數查找(可無頭測試);以標題操作的設定器透過可注入 driver(`snap_window` 接縫模式)套用,預設為 Win32。
+
 ## 本次更新 (2026-06-23) — 局部動態 / 活動偵測
 
 找出兩幀之間哪些子區域在動。完整參考:[`docs/source/Zh/doc/new_features/v146_features_doc.rst`](../docs/source/Zh/doc/new_features/v146_features_doc.rst)。
diff --git a/WHATS_NEW.md b/WHATS_NEW.md
index 1c821895..2fab21c0 100644
--- a/WHATS_NEW.md
+++ b/WHATS_NEW.md
@@ -1,5 +1,11 @@
 # What's New — AutoControl
 
+## What's new (2026-06-23) — Window Z-Order (Always-On-Top / Front / Back)
+
+Pin a window on top, raise it, or push it behind. Full reference: [`docs/source/Eng/doc/new_features/v147_features_doc.rst`](docs/source/Eng/doc/new_features/v147_features_doc.rst).
+
+- **`set_topmost` / `bring_to_front` / `send_to_back` / `plan_zorder`** (`AC_set_topmost`, `AC_bring_to_front`, `AC_send_to_back`): the raw `set_window_position` existed but wasn't in the facade, had no title wrapper and no topmost semantics — the standard RPA "always-on-top" was missing. `plan_zorder` is a pure action→`SetWindowPos` constant lookup (headless-testable); the title-based setters apply it through an injectable driver (the `snap_window` seam pattern), Win32 by default. 
+
 ## What's new (2026-06-23) — Localized Motion / Activity Detection
 
 Find which sub-regions are animating between two frames. Full reference: [`docs/source/Eng/doc/new_features/v146_features_doc.rst`](docs/source/Eng/doc/new_features/v146_features_doc.rst).
diff --git a/docs/source/Eng/doc/new_features/v147_features_doc.rst b/docs/source/Eng/doc/new_features/v147_features_doc.rst
new file mode 100644
index 00000000..d6fda0bb
--- /dev/null
+++ b/docs/source/Eng/doc/new_features/v147_features_doc.rst
@@ -0,0 +1,42 @@
+Window Z-Order — Always-On-Top / Front / Back
+=============================================
+
+``windows_window_manage.set_window_position`` exists at the raw Win32 layer but is not
+exported in the package facade, has no title-based wrapper, and no topmost / not-topmost
+semantics — and there was no ``always_on_top`` anywhere outside GUI overlay code. This
+adds the standard RPA z-order primitive: a pure ``plan_zorder`` that maps an action to
+the ``SetWindowPos`` insert-after constant, plus title-based ``set_topmost`` /
+``bring_to_front`` / ``send_to_back`` over an injectable driver (the same seam pattern
+as ``snap_window``).
+
+The planning is pure and headless-testable; only the default driver touches Win32
+(returning ``False`` on other platforms). Imports no ``PySide6``.
+
+Headless API
+------------
+
+.. code-block:: python
+
+    from je_auto_control import (set_topmost, bring_to_front, send_to_back,
+                                 plan_zorder)
+
+    set_topmost("Media Player")          # pin always-on-top
+    set_topmost("Media Player", False)   # release
+    bring_to_front("Editor")
+    send_to_back("Background Monitor")
+
+    plan_zorder("topmost")["insert_after"]   # -1 (HWND_TOPMOST), pure / testable
+
+``plan_zorder(action)`` (``top`` / ``bottom`` / ``topmost`` / ``notopmost``) returns the
+``SetWindowPos`` descriptor (``insert_after`` constant + ``SWP_NOMOVE`` / ``SWP_NOSIZE``
+flags); unknown actions raise ``ValueError``. ``set_topmost`` / ``bring_to_front`` /
+``send_to_back`` resolve the window by title and apply the action through the default
+Win32 driver (or an injected one in tests), returning whether it was applied.
+
+Executor commands
+-----------------
+
+``AC_set_topmost`` (``title`` / ``on`` → ``{applied}``), ``AC_bring_to_front`` and
+``AC_send_to_back`` (``title`` → ``{applied}``). They are exposed as the MCP tools
+``ac_set_topmost`` / ``ac_bring_to_front`` / ``ac_send_to_back`` and as Script Builder
+commands under **Window**.
diff --git a/docs/source/Eng/eng_index.rst b/docs/source/Eng/eng_index.rst
index 7e8a7540..41045d39 100644
--- a/docs/source/Eng/eng_index.rst
+++ b/docs/source/Eng/eng_index.rst
@@ -169,6 +169,7 @@ Comprehensive guides for all AutoControl features.
    doc/new_features/v144_features_doc
    doc/new_features/v145_features_doc
    doc/new_features/v146_features_doc
+   doc/new_features/v147_features_doc
    doc/ocr_backends/ocr_backends_doc
    doc/observability/observability_doc
    doc/operations_layer/operations_layer_doc
diff --git a/docs/source/Zh/doc/new_features/v147_features_doc.rst b/docs/source/Zh/doc/new_features/v147_features_doc.rst
new file mode 100644
index 00000000..54f50614
--- /dev/null
+++ b/docs/source/Zh/doc/new_features/v147_features_doc.rst
@@ -0,0 +1,35 @@
+視窗 Z-order——置頂 / 移到最前 / 移到最後
+=========================================
+
+``windows_window_manage.set_window_position`` 在原始 Win32 層存在,但未在套件 facade 匯出、沒有以標題為基礎的包裝、
+也沒有 topmost / not-topmost 語意——而 GUI 疊圖以外的地方完全沒有 ``always_on_top``。本功能加入標準 RPA z-order
+基本能力:純函式 ``plan_zorder`` 將動作對應到 ``SetWindowPos`` 的 insert-after 常數,以及以標題操作、可注入 driver
+的 ``set_topmost`` / ``bring_to_front`` / ``send_to_back``(與 ``snap_window`` 相同的接縫模式)。
+
+規劃為純函式且可無頭測試;只有預設 driver 觸及 Win32(其他平台回傳 ``False``)。不匯入 ``PySide6``。
+
+無頭 API
+--------
+
+.. code-block:: python
+
+    from je_auto_control import (set_topmost, bring_to_front, send_to_back,
+                                 plan_zorder)
+
+    set_topmost("Media Player")          # 置頂
+    set_topmost("Media Player", False)   # 取消置頂
+    bring_to_front("Editor")
+    send_to_back("Background Monitor")
+
+    plan_zorder("topmost")["insert_after"]   # -1(HWND_TOPMOST),純 / 可測
+
+``plan_zorder(action)``(``top`` / ``bottom`` / ``topmost`` / ``notopmost``)回傳 ``SetWindowPos`` 描述符
+(``insert_after`` 常數 + ``SWP_NOMOVE`` / ``SWP_NOSIZE`` 旗標);未知動作丟出 ``ValueError``。``set_topmost`` /
+``bring_to_front`` / ``send_to_back`` 以標題解析視窗並透過預設 Win32 driver(測試時注入)套用動作,回傳是否已套用。
+
+執行器命令
+----------
+
+``AC_set_topmost``(``title`` / ``on`` → ``{applied}``)、``AC_bring_to_front`` 與 ``AC_send_to_back``
+(``title`` → ``{applied}``)。它們以 MCP 工具 ``ac_set_topmost`` / ``ac_bring_to_front`` / ``ac_send_to_back``
+以及 Script Builder 中 **Window** 分類下的命令提供。
diff --git a/docs/source/Zh/zh_index.rst b/docs/source/Zh/zh_index.rst
index 5c77e039..fb1dbf0b 100644
--- a/docs/source/Zh/zh_index.rst
+++ b/docs/source/Zh/zh_index.rst
@@ -169,6 +169,7 @@ AutoControl 所有功能的完整使用指南。
    doc/new_features/v144_features_doc
    doc/new_features/v145_features_doc
    doc/new_features/v146_features_doc
+   doc/new_features/v147_features_doc
    doc/ocr_backends/ocr_backends_doc
    doc/observability/observability_doc
    doc/operations_layer/operations_layer_doc
diff --git a/je_auto_control/__init__.py b/je_auto_control/__init__.py
index ed962943..4c36f5b4 100644
--- a/je_auto_control/__init__.py
+++ b/je_auto_control/__init__.py
@@ -347,6 +347,10 @@
 from je_auto_control.utils.motion_regions import (
     activity_score, changed_regions, has_motion,
 )
+# Window z-order control (topmost / bring-to-front / send-to-back)
+from je_auto_control.utils.window_zorder import (
+    bring_to_front, plan_zorder, send_to_back, set_topmost,
+)
 # CI workflow annotations (GitHub Actions)
 from je_auto_control.utils.ci_annotations import (
     emit_annotations, format_annotation,
@@ -1209,6 +1213,10 @@ def start_autocontrol_gui(*args, **kwargs):
     "changed_regions",
     "has_motion",
     "activity_score",
+    "plan_zorder",
+    "set_topmost",
+    "bring_to_front",
+    "send_to_back",
     "emit_annotations", "format_annotation",
     "ClipboardHistory", "default_clipboard_history",
     "analyze_heal_log", "heal_stats", "scan_secrets",
diff --git a/je_auto_control/gui/script_builder/command_schema.py b/je_auto_control/gui/script_builder/command_schema.py
index 6180abb7..00d83a68 100644
--- a/je_auto_control/gui/script_builder/command_schema.py
+++ b/je_auto_control/gui/script_builder/command_schema.py
@@ -676,6 +676,24 @@ def _add_window_specs(specs: List[CommandSpec]) -> None:
         ),
         description="Cascade a list of windows diagonally.",
     ))
+    specs.append(CommandSpec(
+        "AC_set_topmost", "Window", "Set Always-On-Top",
+        fields=(
+            FieldSpec("title", FieldType.STRING),
+            FieldSpec("on", FieldType.BOOL, optional=True, default=True),
+        ),
+        description="Pin a window always-on-top (or release it).",
+    ))
+    specs.append(CommandSpec(
+        "AC_bring_to_front", "Window", "Bring Window to Front",
+        fields=(FieldSpec("title", FieldType.STRING),),
+        description="Raise a window to the top of the z-order.",
+    ))
+    specs.append(CommandSpec(
+        "AC_send_to_back", "Window", "Send Window to Back",
+        fields=(FieldSpec("title", FieldType.STRING),),
+        description="Send a window to the bottom of the z-order.",
+    ))
     specs.append(CommandSpec(
         "AC_wait_window_closed", "Window", "Wait for Window to Close",
         fields=(
diff --git a/je_auto_control/utils/executor/action_executor.py b/je_auto_control/utils/executor/action_executor.py
index 888991f4..3bbec21e 100644
--- a/je_auto_control/utils/executor/action_executor.py
+++ b/je_auto_control/utils/executor/action_executor.py
@@ -3735,6 +3735,24 @@ def _resolve_after(after: Any):
     return np.asarray(pil_screenshot().convert("RGB"))
 
 
+def _set_topmost(title: str, on: Any = True) -> Dict[str, Any]:
+    """Adapter: pin a window always-on-top (or release it)."""
+    from je_auto_control.utils.window_zorder import set_topmost
+    return {"applied": set_topmost(title, bool(on))}
+
+
+def _bring_to_front(title: str) -> Dict[str, Any]:
+    """Adapter: raise a window to the top of the z-order."""
+    from je_auto_control.utils.window_zorder import bring_to_front
+    return {"applied": bring_to_front(title)}
+
+
+def _send_to_back(title: str) -> Dict[str, Any]:
+    """Adapter: send a window to the bottom of the z-order."""
+    from je_auto_control.utils.window_zorder import send_to_back
+    return {"applied": send_to_back(title)}
+
+
 def _with_modifiers(modifiers: Any, actions: Any) -> Dict[str, Any]:
     """Adapter: run nested actions while modifier keys are held down."""
     import json
@@ -5482,6 +5500,9 @@ def __init__(self):
             "AC_histogram_changed": _histogram_changed,
             "AC_changed_regions": _changed_regions,
             "AC_has_motion": _has_motion,
+            "AC_set_topmost": _set_topmost,
+            "AC_bring_to_front": _bring_to_front,
+            "AC_send_to_back": _send_to_back,
             "AC_tile_rect": _tile_rect,
             "AC_grid_rects": _grid_rects,
             "AC_cascade_rects": _cascade_rects,
diff --git a/je_auto_control/utils/mcp_server/tools/_factories.py b/je_auto_control/utils/mcp_server/tools/_factories.py
index cbaa14f8..d24ca817 100644
--- a/je_auto_control/utils/mcp_server/tools/_factories.py
+++ b/je_auto_control/utils/mcp_server/tools/_factories.py
@@ -3158,6 +3158,38 @@ def motion_regions_tools() -> List[MCPTool]:
     ]
 
 
+def window_zorder_tools() -> List[MCPTool]:
+    return [
+        MCPTool(
+            name="ac_set_topmost",
+            description=("Pin the window matching 'title' always-on-top (or release "
+                         "it with on=false). Returns {applied}. Windows only."),
+            input_schema=schema({
+                "title": {"type": "string"},
+                "on": {"type": "boolean"}},
+                required=["title"]),
+            handler=h.set_topmost,
+            annotations=SIDE_EFFECT_ONLY,
+        ),
+        MCPTool(
+            name="ac_bring_to_front",
+            description=("Raise the window matching 'title' to the top of the "
+                         "z-order. Returns {applied}. Windows only."),
+            input_schema=schema({"title": {"type": "string"}}, required=["title"]),
+            handler=h.bring_to_front,
+            annotations=SIDE_EFFECT_ONLY,
+        ),
+        MCPTool(
+            name="ac_send_to_back",
+            description=("Send the window matching 'title' to the bottom of the "
+                         "z-order. Returns {applied}. Windows only."),
+            input_schema=schema({"title": {"type": "string"}}, required=["title"]),
+            handler=h.send_to_back,
+            annotations=SIDE_EFFECT_ONLY,
+        ),
+    ]
+
+
 def ssim_tools() -> List[MCPTool]:
     return [
         MCPTool(
@@ -6664,7 +6696,7 @@ def media_assert_tools() -> List[MCPTool]:
     monitor_layout_tools, actionability_tools, element_parse_tools,
     hsv_segment_tools, text_regions_tools, edge_lines_tools, expect_poll_tools,
     locator_chain_tools, rich_clipboard_tools, img_histogram_tools,
-    motion_regions_tools, plugin_sdk_tools, governance_tools,
+    motion_regions_tools, window_zorder_tools, plugin_sdk_tools, governance_tools,
     credential_lease_tools, egress_tools, approval_testing_tools,
     trajectory_eval_tools, compliance_tools, agent_trace_tools,
     video_report_tools, fuzzy_tools, artifact_store_tools, image_dedup_tools,
diff --git a/je_auto_control/utils/mcp_server/tools/_handlers.py b/je_auto_control/utils/mcp_server/tools/_handlers.py
index 09b0ceaf..f783770b 100644
--- a/je_auto_control/utils/mcp_server/tools/_handlers.py
+++ b/je_auto_control/utils/mcp_server/tools/_handlers.py
@@ -2268,6 +2268,21 @@ def has_motion(before, after=None, threshold=25, min_area=80):
     return _has_motion(before, after, threshold, min_area)
 
 
+def set_topmost(title, on=True):
+    from je_auto_control.utils.executor.action_executor import _set_topmost
+    return _set_topmost(title, on)
+
+
+def bring_to_front(title):
+    from je_auto_control.utils.executor.action_executor import _bring_to_front
+    return _bring_to_front(title)
+
+
+def send_to_back(title):
+    from je_auto_control.utils.executor.action_executor import _send_to_back
+    return _send_to_back(title)
+
+
 def detect_drift(reference, current, threshold=0.25, bins=10):
     from je_auto_control.utils.executor.action_executor import _detect_drift
     return _detect_drift(reference, current, threshold, bins)
diff --git a/je_auto_control/utils/window_zorder/__init__.py b/je_auto_control/utils/window_zorder/__init__.py
new file mode 100644
index 00000000..7c3aee9b
--- /dev/null
+++ b/je_auto_control/utils/window_zorder/__init__.py
@@ -0,0 +1,7 @@
+"""Window z-order control (topmost / bring-to-front / send-to-back)."""
+from je_auto_control.utils.window_zorder.window_zorder import (
+    available_actions, bring_to_front, plan_zorder, send_to_back, set_topmost,
+)
+
+__all__ = ["available_actions", "bring_to_front", "plan_zorder", "send_to_back",
+           "set_topmost"]
diff --git a/je_auto_control/utils/window_zorder/window_zorder.py b/je_auto_control/utils/window_zorder/window_zorder.py
new file mode 100644
index 00000000..b228ee29
--- /dev/null
+++ b/je_auto_control/utils/window_zorder/window_zorder.py
@@ -0,0 +1,69 @@
+"""Window z-order control — always-on-top / topmost, bring-to-front, send-to-back.
+
+``windows_window_manage.set_window_position(hwnd, position)`` exists at the raw Win32
+layer but is **not** exported in the package facade, has no title-based wrapper, and no
+topmost / not-topmost semantics — and there is no ``always_on_top`` anywhere outside
+GUI overlay code. This adds the standard RPA z-order primitive: a pure ``plan_zorder``
+that maps an action to the ``SetWindowPos`` insert-after constant, plus title-based
+``set_topmost`` / ``bring_to_front`` / ``send_to_back`` over an injectable driver (the
+same seam pattern as ``snap_window``).
+
+The planning is pure and headless-testable; only the default driver touches Win32
+(returning ``False`` on other platforms). Imports no ``PySide6``.
+"""
+import sys
+from typing import Any, Callable, Dict
+
+ZOrderDriver = Callable[[str, str], bool]
+
+# action -> SetWindowPos hwndInsertAfter constant
+_ACTIONS = {"top": 0, "bottom": 1, "topmost": -1, "notopmost": -2}
+
+
+def available_actions() -> list:
+    """Return the supported z-order action names."""
+    return list(_ACTIONS)
+
+
+def plan_zorder(action: str) -> Dict[str, Any]:
+    """Return the ``SetWindowPos`` descriptor for a z-order ``action``.
+
+    ``action`` is one of ``top`` / ``bottom`` / ``topmost`` / ``notopmost``; the
+    result carries the ``insert_after`` HWND constant and the move/size-preserving
+    flags. Raises ``ValueError`` for an unknown action.
+    """
+    if action not in _ACTIONS:
+        raise ValueError(f"unknown z-order action: {action!r}")
+    return {"action": action, "insert_after": _ACTIONS[action],
+            "flags": ["SWP_NOMOVE", "SWP_NOSIZE"]}
+
+
+def _default_driver(title: str, action: str) -> bool:
+    """Apply a z-order action to the window matching ``title`` (Win32 only)."""
+    if not sys.platform.startswith("win"):
+        return False
+    from je_auto_control.wrapper.auto_control_window import find_window
+    hit = find_window(title)
+    if hit is None:
+        return False
+    from je_auto_control.windows.window import windows_window_manage as wm
+    wm.set_window_position(int(hit[0]), plan_zorder(action)["insert_after"])
+    return True
+
+
+def set_topmost(title: str, on: bool = True, *,
+                driver: Callable[[str, str], bool] = None) -> bool:
+    """Pin the window matching ``title`` always-on-top (or release it when ``on`` is False)."""
+    return (driver or _default_driver)(title, "topmost" if on else "notopmost")
+
+
+def bring_to_front(title: str, *,
+                   driver: Callable[[str, str], bool] = None) -> bool:
+    """Raise the window matching ``title`` to the top of the z-order."""
+    return (driver or _default_driver)(title, "top")
+
+
+def send_to_back(title: str, *,
+                 driver: Callable[[str, str], bool] = None) -> bool:
+    """Send the window matching ``title`` to the bottom of the z-order."""
+    return (driver or _default_driver)(title, "bottom")
diff --git a/test/unit_test/headless/test_window_zorder_batch.py b/test/unit_test/headless/test_window_zorder_batch.py
new file mode 100644
index 00000000..9809ba54
--- /dev/null
+++ b/test/unit_test/headless/test_window_zorder_batch.py
@@ -0,0 +1,67 @@
+"""Headless tests for window z-order control. No Qt; driver is injected."""
+import je_auto_control as ac
+from je_auto_control.utils.window_zorder import (
+    available_actions, bring_to_front, plan_zorder, send_to_back, set_topmost,
+)
+
+
+def _recorder():
+    calls = []
+
+    def driver(title, action):
+        calls.append((title, action))
+        return True
+
+    return driver, calls
+
+
+def test_plan_zorder_maps_constants():
+    assert plan_zorder("top")["insert_after"] == 0
+    assert plan_zorder("bottom")["insert_after"] == 1
+    assert plan_zorder("topmost")["insert_after"] == -1
+    assert plan_zorder("notopmost")["insert_after"] == -2
+    assert plan_zorder("top")["flags"] == ["SWP_NOMOVE", "SWP_NOSIZE"]
+
+
+def test_plan_zorder_unknown_raises():
+    try:
+        plan_zorder("sideways")
+    except ValueError:
+        return
+    raise AssertionError("expected ValueError")
+
+
+def test_set_topmost_on_and_off():
+    driver, calls = _recorder()
+    assert set_topmost("Editor", True, driver=driver) is True
+    assert set_topmost("Editor", False, driver=driver) is True
+    assert calls == [("Editor", "topmost"), ("Editor", "notopmost")]
+
+
+def test_bring_to_front_and_send_to_back():
+    driver, calls = _recorder()
+    bring_to_front("Editor", driver=driver)
+    send_to_back("Editor", driver=driver)
+    assert calls == [("Editor", "top"), ("Editor", "bottom")]
+
+
+def test_available_actions():
+    assert set(available_actions()) == {"top", "bottom", "topmost", "notopmost"}
+
+
+# --- wiring ---------------------------------------------------------------
+
+def test_wiring():
+    known = set(ac.executor.known_commands())
+    assert {"AC_set_topmost", "AC_bring_to_front", "AC_send_to_back"} <= known
+    from je_auto_control.utils.mcp_server.tools import build_default_tool_registry
+    names = {t.name for t in build_default_tool_registry()}
+    assert {"ac_set_topmost", "ac_bring_to_front", "ac_send_to_back"} <= names
+    from je_auto_control.gui.script_builder.command_schema import _build_specs
+    specs = {s.command for s in _build_specs()}
+    assert {"AC_set_topmost", "AC_bring_to_front", "AC_send_to_back"} <= specs
+
+
+def test_facade_exports():
+    for attr in ("plan_zorder", "set_topmost", "bring_to_front", "send_to_back"):
+        assert hasattr(ac, attr) and attr in ac.__all__