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
public void dragSetData( DragSourceEvent event )
			{
				if ( TextTransfer.getInstance( )
						.isSupportedType( event.dataType ) )
				{
					TreeItem[] selection = tree.getSelection( );
					if ( selection.length > 0 )
					{
						event.data = selection[0].getData( ITEM_DATA_KEY_TEXT );
					}
				}
			}
		} );
	}
	/**
	 * Insert a text string into the text area
	 * 
	 * @param text
	 */
	protected void insertText( String text )
	{
		StyledText textWidget = expressionViewer.getTextWidget( );
		if ( !textWidget.isEnabled( ) )
		{
			return;
		}
		int selectionStart = textWidget.getSelection( ).x;
		if ( text.equalsIgnoreCase( "x++" ) ) 
		{
			text = textWidget.getSelectionText( ) + "++";