Bug 154832 Wrong node is added to Report Parameters for cascading parameter in Palette view
Description: Wrong node is added to Report Parameters for cascading parameter in Palette view. Steps to reproduce: 1. New a report, add a cascading parameter 2. Switch to Script tab in Editor view, and then switch to Palette view 3. Expand Report Parameters node Expected result: A cascading parameter group is added to Report Parameters node Actual result: Expect a cascading parameter group is added to Report Parameters node, the children of the cascading parameter group are added as scalar parameters
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/ExpressionTreeSupport.java
String text = (String) item.getData( ITEM_DATA_KEY_TOOLTIP );
						tree.setToolTipText( text );
					}
				}
			}
		} );
	}
	/**
	 * Add double click behaviour. Must set Tree before execution.
	 * 
	 */
	public void addMouseListener( )
	{
		Assert.isNotNull( tree );
		tree.addMouseListener( new MouseAdapter( ) {
			public void mouseDoubleClick( MouseEvent event )
			{
				TreeItem[] selection = getTreeSelection( );
				if ( selection == null || selection.length <= 0 )
					return;
				TreeItem item = selection[0];
				if ( item != null )
				{
					Object obj = item.getData( ITEM_DATA_KEY_TEXT );
					Boolean isEnabled = (Boolean) item.getData( ITEM_DATA_KEY_ENABLED );
					if ( obj != null && isEnabled.booleanValue( ) )
					{
						String text = (String) obj;
						insertText( text );
					}