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
}
			}
			for ( Iterator itor = getDataSetList( handle.getContainer( ) )
					.iterator( ); itor.hasNext( ); )
			{
				DesignElementHandle dataSet = (DesignElementHandle) itor.next( );
				if ( !dataSetList.contains( dataSet ) )
				{
					dataSetList.add( dataSet );
				}
			}
		}
		return dataSetList;
	}
	/**
	 * Get definition of model property.
	 * 
	 * @param elementName
	 * @param propertyName
	 */
	public static IElementPropertyDefn getPropertyDefn( String elementName,
			String propertyName )
	{
		IElementDefn elementDefn = DesignEngine.getMetaDataDictionary( )
				.getElement( elementName );
		if ( elementDefn != null )
		{
			return elementDefn.getProperty( propertyName );
		}
		return null;