Update with TE2 specific adaptations

Author: mlonsk

content/how-tos/scripting-ui-helpers.md

@@ -33,7 +33,7 @@ var table = SelectTable();                             // pick a table
 var column = SelectColumn(table.Columns);              // pick from filtered columns
 var measure = SelectMeasure();                         // pick a measure
 var obj = SelectObject<DataSource>(Model.DataSources); // generic selection
-var items = SelectObjects(collection);                 // multi-select
+var items = SelectObjects(collection);                 // multi-select (TE3 only)
 
 // Evaluate DAX
 var result = EvaluateDax("COUNTROWS('Sales')");        // run DAX on connected model
@@ -107,7 +107,10 @@ catch
 }
 ```
 
-### Multi-select
+### Multi-select (Tabular Editor 3 only)
+
+> [!NOTE]
+> `SelectObjects()` is only available in Tabular Editor 3. In Tabular Editor 2, use a single-select dialog in a loop or filter the selection before running the script.
 
 `SelectObjects()` allows the user to pick multiple objects.
 

content/how-tos/scripting-use-selected-object.md

@@ -118,10 +118,10 @@ var newMeasure = table.AddMeasure(
 
 ## Mixed selections
 
-When you need to handle multiple object types from the selection, use `Selected.Objects` which returns all selected items as `ITabularNamedObject`.
+When you need to handle multiple object types from the selection, iterate `Selected` directly. The `Selected` variable itself implements `IEnumerable<ITabularNamedObject>`.
 
 ```csharp
-foreach (var obj in Selected.Objects)
+foreach (var obj in Selected)
 {
     if (obj is IDescriptionObject desc)
         desc.Description = "Reviewed on " + DateTime.Today.ToString("yyyy-MM-dd");

content/how-tos/scripting-work-with-expressions.md

@@ -89,10 +89,19 @@ foreach (var col in Selected.Columns)
 
 ## The IExpressionObject interface
 
-Objects that hold expressions implement `IExpressionObject`. Cast to the interface for generic code that works across measures, partitions, calculation items, etc.
+Objects that hold expressions implement `IExpressionObject`. In Tabular Editor 2, this interface provides only the `Expression` property. In Tabular Editor 3, it adds `GetExpression()`, `SetExpression()` and `GetExpressionProperties()` for working with multiple expression types on a single object.
 
 ```csharp
-// List all expression types on an object
+// Tabular Editor 2: use the Expression property directly
+measure.Expression = "SUM('Sales'[Amount])";
+string dax = measure.Expression;
+```
+
+> [!NOTE]
+> The following `GetExpression`/`SetExpression` pattern is only available in Tabular Editor 3. In Tabular Editor 2, access the `Expression` property directly on the object.
+
+```csharp
+// Tabular Editor 3 only: list all expression types on an object
 var exprObj = (IExpressionObject)measure;
 foreach (var prop in exprObj.GetExpressionProperties())
 {
@@ -106,7 +115,7 @@ exprObj.SetExpression(ExpressionProperty.Expression, "SUM('Sales'[Amount])");
 exprObj.SetExpression(ExpressionProperty.FormatStringExpression, "\"$#,##0.00\"");
 ```
 
-The `ExpressionProperty` enum includes:
+The `ExpressionProperty` enum (Tabular Editor 3 only) includes:
 
 | Value | Used on |
 |---|---|