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
* Gets the root of the viewer
	 * 
	 * @return Returns the root
	 */
	public ModuleHandle getRoot( )
	{
		return reportHandle;
	}
	/**
	 * The <code>Page</code> implementation of this <code>IPage</code>
	 * method disposes of this page's control (if it has one and it has not
	 * already been disposed). Disposes the visitor of the element
	 */
	public void dispose( )
	{
		if ( visitor != null )
		{
			visitor.removeListener( getRoot( ) );
			visitor.dispose( );
			visitor = null;
		}
		super.dispose( );
	}
	/**
	 * Refreshes the focus and the focus container of the tree view. And applies
	 * the visitor to the given focus.
	 * 
	 * @param focus
	 *            the design element
	 * @param ev