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 notification event
	 */
	public void elementChanged( DesignElementHandle focus, NotificationEvent ev )
	{
		if ( getTreeViewer( ) == null
				|| getTreeViewer( ).getControl( ).isDisposed( ) )
		{
			return;
		}
		getTreeViewer( ).refresh( );
		expandNodeAfterCreation( ev );
		deleteConfigVariable( focus, ev );
		getListenerElementVisitor( ).addListener( focus );
	}
	/**
	 * Gets the visitor.
	 * 
	 * @return the visitor
	 */
	private ListenerElementVisitor getListenerElementVisitor( )
	{
		if ( visitor == null )
		{
			visitor = new ListenerElementVisitor( this );
		}
		return visitor;
	}
	/**
	 * Deletes config variable when parameter is deleted. Config variable is
	 * used to store default value in the dialogue when preview page