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.editors.schematic/src/org/eclipse/birt/report/designer/internal/ui/editors/script/TreeViewPalettePage.java
treeCommon.setExpressionViewer( getViewer( ) );
		treeCommon.createDefaultExpressionTree( SessionHandleAdapter.getInstance( )
				.getReportDesignHandle( )
				.getVisibleDataSets( ) );
		treeCommon.addMouseTrackListener( );
		treeCommon.addMouseListener( );
		treeCommon.addDragSupportToTree( );
		treeCommon.addDropSupportToViewer( );
		
		tree.setToolTipText( "" ); 
	}
	/**
	 * get tool tip text from a string array that contains the text, usage and
	 * description
	 * 
	 * @param tuple
	 * @return
	 */
	
	
	
	
	/**
	 * Releases the palette viewer from the edit domain
	 * 
	 * @see Page#dispose()
	 */
	public void dispose( )
	{
		super.dispose( );