Bug 134988 [regression]Available items in Query didn't change when change data source in Edit Data Set Dialog.
Description: Available items in Query didn't change when change data source in Edit Data Set Dialog. Steps to reproduce: 1. New two different data sources. 2. New a dataset, change data source, view Available Items in Query pane. Expected result: Available Items in Query pane changed according to new Data source. Actual result: Available Items in Query pane kept unchanged.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/property/AbstractPropertyDialog.java
}
	private final Control createTreeViewer( Composite parent )
	{
		viewer = new TreeViewer( parent );
		viewer.addSelectionChangedListener( new ISelectionChangedListener( ) {
			public void selectionChanged( SelectionChangedEvent event )
			{
				final PropertyNode selectedNode = (PropertyNode) ( (IStructuredSelection) event
						.getSelection( ) ).getFirstElement( );
				if ( processSelection )
				{
					BusyIndicator.showWhile( getShell( ).getDisplay( ),
							new Runnable( ) {
								public void run( )
								{
									showSelectionPage( selectedNode );
								}
							} );
				}
				processSelection = true;
			}
		} );
		viewer.getTree( ).addMouseTrackListener( new MouseTrackAdapter( ) {
			public void mouseHover( MouseEvent event )
			{
				Widget widget = event.widget;
				if ( widget == viewer.getTree( ) )
				{
					Point pt = new Point( event.x, event.y );
					TreeItem item = viewer.getTree( ).getItem( pt );