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
defn = DesignEngine.getMetaDataDictionary( ).getExtension(
					elementName );
		}
		return defn;
	}
	/**
	 * Get display label of report element
	 * 
	 * @param obj
	 */
	public static String getDisplayLabel( Object obj )
	{
		return getDisplayLabel( obj, true );
	}
	/**
	 * Get display label of report element
	 * 
	 * @param obj
	 */
	public static String getDisplayLabel( Object obj, boolean includeElementName )
	{
		if ( obj instanceof DesignElementHandle )
		{
			DesignElementHandle handle = (DesignElementHandle) obj;
			String elementName = handle.getDefn( ).getDisplayName( );
			String displayName;
			if ( handle.getQualifiedName( ) != null
					&& !handle.getQualifiedName( ).equals( handle.getName( ) ) )
			{
				displayName = handle.getQualifiedName( );