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
public static final String ELEMENT_LABELCONTENT_PROPERTY = "labelContent"; 
	private static HashMap propertiesMap = new HashMap( );
	private static ArrayList notSupportList = new ArrayList( );
	static
	{
		propertiesMap
				.put( LabelHandle.TEXT_PROP, ELEMENT_LABELCONTENT_PROPERTY );
		propertiesMap.put( TextItemHandle.CONTENT_PROP,
				ELEMENT_LABELCONTENT_PROPERTY );
		
		notSupportList.add( DesignEngine.getMetaDataDictionary( ).getElement(
				ReportDesignConstants.LINE_ITEM ) );
		notSupportList.add( DesignEngine.getMetaDataDictionary( ).getElement(
				ReportDesignConstants.TEMPLATE_REPORT_ITEM ) );
		notSupportList.add( DesignEngine.getMetaDataDictionary( ).getElement(
				ReportDesignConstants.FREE_FORM_ITEM ) );
		notSupportList.add( DesignEngine.getMetaDataDictionary( ).getElement(
				ReportDesignConstants.GRAPHIC_MASTER_PAGE_ELEMENT ) );
	}
	/**
	 * Gets the support list of the given parent element and the slotID.
	 * 
	 * @param parent
	 *            the parent element
	 * @param slotId
	 *            the slotID
	 * @return the element list that is supported with the given parent element
	 *         and in the given slotID
	 */
	public static List getElementSupportList( DesignElementHandle parent,