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
ScalarParameterHandle transferParameter = (ScalarParameterHandle) ( (Object[]) transfer )[0];
					if ( transferParameter.getContainer( ) instanceof CascadingParameterGroupHandle )
						return RESULT_NO;
				}
				return RESULT_UNKNOW;
			}
		};
		dropListener.addDropConstraint( ScalarParameterHandle.class,
				cascadingParameterGroupChildrenConstraint );
		dropListener.addDropConstraint( ParameterGroupHandle.class,
				cascadingParameterGroupChildrenConstraint );
		dropListener.addDropConstraint( SlotHandle.class,
				cascadingParameterGroupChildrenConstraint );
		getTreeViewer( ).addDropSupport( ops, transfers, dropListener );
	}
	/**
	 * Initializes the root of the view
	 * 
	 */
	private void initRoot( )
	{
		SlotHandle sources =  getRoot( ).getDataSources( );
		SlotHandle sets =  getRoot( ).getDataSets( ) ;
		SlotHandle parameters =  getRoot( ).getParameters( );
		getTreeViewer( ).setInput( new Object[]{
				sources, sets, parameters
		} );
		getListenerElementVisitor( ).addListener( getRoot( ) );
	}
	/**