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
{
		for ( int i = 0; i < texts.length; i++ )
		{
			createSubTreeItem( parent,
					texts[i][0],
					image,
					texts[i][0],
					texts[i][1],
					true );
		}
	}
	/**
	 * Adds mouse track listener.Must set Tree before execution.
	 * 
	 */
	public void addMouseTrackListener( )
	{
		Assert.isNotNull( tree );
		tree.addMouseTrackListener( new MouseTrackAdapter( ) {
			public void mouseHover( MouseEvent event )
			{
				Widget widget = event.widget;
				if ( widget == tree )
				{
					Point pt = new Point( event.x, event.y );
					TreeItem item = tree.getItem( pt );
					if ( item == null )
						tree.setToolTipText( "" );
					else
					{