Bug 165677 folder is not opened by double click
Data explorer pane contains following tree: + Data Sources - Postgres + Data Sets - Header DS - Chart DS + Report Parameters - Id It is common then if you double click on menu item, that is folder for other menu items (submenu), that it is opened. But in BIRT I can click to Data Sources (Data Sets, Report Params) as many times as I want but it never opens the submenu. In other words, when I doubleclick Data Sets, I want to open it and see which data sets are defined.
UI/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/internal/ui/views/data/DataViewTreeViewerPage.java
* 
	 * @param ev
	 *            delete event
	 */
	private void deleteConfigVariable( DesignElementHandle handle,
			NotificationEvent ev )
	{
		String variableName = null;
		if ( ev instanceof ContentEvent && handle instanceof ModuleHandle )
		{
			ContentEvent event = (ContentEvent) ev;
			DesignElementHandle contentHandle = event.getContent( )
					.getHandle( getRoot( ).getModule( ) );
			if ( event.getAction( ) == ContentEvent.REMOVE
					&& contentHandle instanceof ParameterHandle )
			{
				variableName = contentHandle.getName( );
			}
		}
		else if ( ev instanceof NameEvent && handle instanceof ParameterHandle )
		{
			variableName = ( (NameEvent) ev ).getOldName( );
		}
		else if ( ev instanceof PropertyEvent
				&& handle instanceof ParameterHandle )
		{
			variableName = handle.getName( );
		}
		if ( variableName != null )
		{