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
*            the handle of the report design
	 */
	public DataViewTreeViewerPage( ModuleHandle reportHandle )
	{
		super( );
		this.reportHandle = reportHandle;
	}
	/**
	 * Creates the tree view
	 * 
	 * @param parent
	 *            the parent
	 */
	protected TreeViewer createTreeViewer( Composite parent )
	{
		TreeViewer treeViewer = new TreeViewer( parent, SWT.MULTI
				| SWT.H_SCROLL
				| SWT.V_SCROLL );
		return treeViewer;
	}
	/**
	 * Initializes the data view page.
	 */
	protected void initPage( )
	{
		createContextMenus( );
		handleGlobalAction( );
		
		new RenameListener( getTreeViewer( ) ).apply( );
		getTreeViewer( ).setSorter( new ItemSorter( ) );