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
}
			}
		} );
	}
	protected TreeItem[] getTreeSelection( )
	{
		return tree.getSelection( );
	}
	/**
	 * Adds drag support to tree..Must set tree before execution.
	 */
	public void addDragSupportToTree( )
	{
		Assert.isNotNull( tree );
		DragSource dragSource = new DragSource( tree, DND.DROP_COPY );
		dragSource.setTransfer( new Transfer[]{
			TextTransfer.getInstance( )
		} );
		dragSource.addDragListener( new DragSourceAdapter( ) {
			public void dragStart( DragSourceEvent event )
			{
				TreeItem[] selection = tree.getSelection( );
				if ( selection.length <= 0
						|| selection[0].getData( ITEM_DATA_KEY_TEXT ) == null
						|| !( (Boolean) selection[0].getData( ITEM_DATA_KEY_ENABLED ) ).booleanValue( ) )
				{
					event.doit = false;
					return;
				}
			}