_setPropertyRetroactively : function( dropTarget, property, value ) {

      var wm = org.eclipse.swt.WidgetManager.getInstance();

      for( var type in this._dropTargetEventQueue ) {

        var event = this._dropTargetEventQueue[ type ];

        if( event[ "id" ] == wm.findIdByWidget( dropTarget ) ) {

          var eventName = event[ "eventName" ];

          event[ "param" ][ eventName + "." + property ] = value;

        }

      } 

    },

      this._setPropertyRetroactively( widget, "operation", operation );

      this._setPropertyRetroactively( widget, "dataType", type );

    // See Bug 301276

    testSetPropertyRetroactively : function() {

      var testUtil = org.eclipse.rwt.test.fixture.TestUtil;

      var dndSupport = org.eclipse.rwt.DNDSupport.getInstance();

      var dndHandler = qx.event.handler.DragAndDropHandler.getInstance()

      var leftButton = qx.event.type.MouseEvent.buttons.left;

      // request uses SWT-like event-names: 

      var dragOver = "org.eclipse.swt.dnd.dragEnter";

      var dragMove = "org.eclipse.swt.dnd.dragOver";

      testUtil.prepareTimerUse();

      testUtil.initRequestLog();

      var source = this.createSource();

      var target = this.createTarget();

      var sourceNode = source._getTargetNode();

      var targetNode = target._getTargetNode();

      var doc = document.body;

      // drag

      testUtil.fakeMouseEventDOM( sourceNode, "mousedown", leftButton, 11, 11 );

      testUtil.clearRequestLog();

      testUtil.fakeMouseEventDOM( doc, "mousemove", leftButton, 25, 15 );

      // Over

      testUtil.fakeMouseEventDOM( targetNode, "mouseover", leftButton, 31, 15 );

      testUtil.fakeMouseEventDOM( targetNode, "mousemove", leftButton, 32, 15 );

      testUtil.forceTimerOnce();

      assertEquals( 2, testUtil.getRequestsSend() );

      var request = testUtil.getRequestLog()[ 1 ];      

      assertTrue( request.search( dragOver + "=w2" ) != -1 );

      assertTrue( request.search( dragOver + ".dataType=null" ) != -1 );

      assertTrue( request.search( dragOver + ".operation=move" ) != -1 );

      testUtil.clearTimerOnceLog();

      testUtil.clearRequestLog();

      // Move

      testUtil.fakeMouseEventDOM( targetNode, "mousemove", leftButton, 33, 15 );

      assertTrue( testUtil.getTimerOnceLog().length > 0 );

      // set properties

      dndSupport.setDataType( target, "76135" );

      dndSupport.setOperationOverwrite( target, "copy" );

      // send event:

      testUtil.forceTimerOnce();

      assertEquals( 1, testUtil.getRequestsSend() );

      var request = testUtil.getRequestLog()[ 0 ];

      assertTrue( request.search( dragMove + "=w2" ) != -1 );      

      assertTrue( request.search( dragMove + ".operation=copy" ) != -1 );

      assertTrue( request.search( dragMove + ".dataType=76135" ) != -1 );

      testUtil.clearTimerOnceLog();

      testUtil.clearRequestLog();

      dndSupport.cancel();

      dndSupport.deregisterDragSource( source );

      dndSupport.deregisterDropTarget( target );

      source.setParent( null );

      source.destroy();

      target.setParent( null );

      target.destroy();

      testUtil.flush();

    },