diff --git a/vtm-playground/src/org/oscim/test/MapsforgeTest.java b/vtm-playground/src/org/oscim/test/MapsforgeTest.java
index 38d5338b2..3489a8477 100644
--- a/vtm-playground/src/org/oscim/test/MapsforgeTest.java
+++ b/vtm-playground/src/org/oscim/test/MapsforgeTest.java
@@ -17,6 +17,7 @@
  */
 package org.oscim.test;
 
+import com.badlogic.gdx.Input;
 import org.mapsforge.map.awt.graphics.AwtGraphicFactory;
 import org.mapsforge.map.layer.hills.AdaptiveClasyHillShading;
 import org.mapsforge.map.layer.hills.DemFolderFS;
@@ -154,6 +155,19 @@ public void dispose() {
         super.dispose();
     }
 
+    @Override
+    protected boolean onKeyDown(int keycode) {
+        if (keycode == Input.Keys.F5) {
+            if (themeFile != null) {
+                mMap.setTheme(new ExternalRenderTheme(themeFile.getAbsolutePath()));
+                mMap.clearMap();
+            }
+            return true;
+        }
+
+        return false;
+    }
+
     static File getDemFolder(String[] args) {
         if (args.length == 0) {
             throw new IllegalArgumentException("missing argument: <mapFile>");