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
getTreeViewer( ).getTree( )
				.addMouseTrackListener( new MouseTrackAdapter( ) {
					public void mouseHover( MouseEvent event )
					{
						Widget widget = event.widget;
						if ( widget == getTreeViewer( ).getTree( ) )
						{
							Point pt = new Point( event.x, event.y );
							TreeItem item = getTreeViewer( ).getTree( )
									.getItem( pt );
							getTreeViewer( ).getTree( )
									.setToolTipText( getTooltip( item ) );
						}
					}
				} );
	}
	private String getTooltip( TreeItem item )
	{
		if ( item != null )
		{
			Object object = item.getData( );
			if ( object instanceof DataSourceHandle
					|| object instanceof ParameterGroupHandle )
			{
				return LABEL_DOUBLE_CLICK;
			}
			StringBuffer tooltip = new StringBuffer( );
			boolean canInsert = InsertInLayoutUtil.handleValidateInsertToLayout( object,
					UIUtil.getCurrentEditPart( ) );
			String text = "(" + item.getText( ) + ")";