Bug 120503 Cascading Parameter can not drop into layout
Details: Cascading Parameter can not drop into layout Step: 1.Open a report design and Create a Sample Data Source and data set by "select * from CLASSICMODELS.CUSTOMERS" 2.New a cascading parameter and create CUSTOMERSNUMBER and CUSTOMERSNAME in parameter named number and name. Press OK 3.Drop parameter name into layout. Actual results: The parameter in Cascading Parameter Group can not drop to layout
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
.getAllDataSets( );
	}
	public static Iterator getThemes( )
	{
		return getThemes( new AlphabeticallyComparator( ) );
	}
	private static Iterator getThemes( AlphabeticallyComparator comparator )
	{
		List themes = SessionHandleAdapter.getInstance( )
				.getReportDesignHandle( ).getAllThemes( );
		Object[] themesArray = themes.toArray( );
		if ( comparator != null )
		{
			Arrays.sort( themesArray, comparator );
		}
		return Arrays.asList( themesArray ).iterator( );
	}
	/**
	 * Generates GroupElementHandle for given model list.
	 * 
	 * @param modelList
	 * @return
	 */
	public static GroupElementHandle getGroupElementHandle( List modelList )
	{
		if ( SessionHandleAdapter.getInstance( ).getReportDesignHandle( ) == null )
		{
			return new GroupElementHandle( SessionHandleAdapter.getInstance( )
					.getReportDesignHandle( ), Collections.EMPTY_LIST );
		}