             return false;
     }
         
-    //----------------------------------
+	//----------------------------------
+	//  closeDropDownOnResize
+	//----------------------------------
+
+    /**
+     *  @private
+     *
+     *  cached value: getStyle("interactionMode") == InteractionMode.TOUCH
+     */
+    private var isTouchInteractionMode:Boolean = false;
+
+    /**
+     *  @private
+     *
+     *  do not know what default value for closeDropDownOnResize will be until styles have been applied,
+     *  but user may set property before that. this flag indicates whether property has been explicitly set,
+     *  and so will not need to be determined from css when stylesInitialized() or styleChanged() is called.
+     */
+    private var isCloseDropDownOnResizeExplicitlySet:Boolean = false;
+
+    /**
+     *  @private
+     */
+    protected var _closeDropDownOnResize:Boolean = true;
+	
+    [Inspectable(category="General", enumeration="true,false", defaultValue="true")]
+	
+    /**
+     *  When <code>true</code>, resizing the system manager
+     *  closes the drop down.
+     *  For mobile applications, this property is set
+ 	 *  to <code>false</code> so that the drop down stays open when the
+     *  page orientation changes.
+     *
+ 	 *  @default true
+     *
+     *  @langversion 3.0
+     *  @playerversion Flash 10
+     *  @playerversion AIR 1.5
+     *  @productversion Flex 4.12
+     */
+    public function get closeDropDownOnResize():Boolean
+	{
+        return _closeDropDownOnResize;
+    }
+
+    /**
+     *  @private
+     */
+    public function set closeDropDownOnResize(value:Boolean):void
+	{
+        setCloseDropDownOnResize(value, true);
+    }
+		
+    /**
+     *  @private
+     */
+    private function setCloseDropDownOnResize(value:Boolean, explicitlySet:Boolean):void
+	{
+        _closeDropDownOnResize = value;
+        isCloseDropDownOnResizeExplicitlySet ||= explicitlySet;
+        if (dropDownController)
+            dropDownController.closeOnResize = _closeDropDownOnResize;
+	}        
+
+	//----------------------------------
     //  userProposedSelectedIndex
     //----------------------------------
 

import flash.geom.Point;

import mx.collections.IList;
import mx.core.mx_internal;
import mx.events.CollectionEvent;
import mx.events.FlexEvent;


            return;
            
        _dropDownController = value;
		
        _dropDownController.addEventListener(DropDownEvent.OPEN, dropDownController_openHandler);
        _dropDownController.addEventListener(DropDownEvent.CLOSE, dropDownController_closeHandler);
            
		_dropDownController.closeOnResize = _closeDropDownOnResize;

		if (openButton)
            _dropDownController.openButton = openButton;
        if (dropDown)
            _dropDownController.dropDown = dropDown;    
