cmpAttribute = null;
	public void widgetDisposed( DisposeEvent e )	{		super.widgetDisposed( e );		cmpTask = null;		cmpAttribute = null;		previewCanvas = null;		previewPainter = null;		if ( whiteColor != null && !whiteColor.isDisposed( ) )		{			whiteColor.dispose( );		}		whiteColor = null;	}