Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/PropertyCommand.java
return null;
		Object input = value;
		
		if ( value instanceof DesignElementHandle )
		{
			DesignElementHandle elementHandle = (DesignElementHandle) value;
			Module root = elementHandle.getModule( );
			input = ReferenceValueUtil.needTheNamespacePrefix( elementHandle
					.getElement( ), root, module );
		}
		Object retValue = null;
		try
		{
			retValue = prop.validateValue( module, input );
		}
		catch ( PropertyValueException ex )
		{
			ex.setElement( element );
			ex.setPropertyName( prop.getName( ) );
			throw ex;
		}
		if ( !( retValue instanceof ElementRefValue ) )
			return retValue;
		
		
		ElementRefValue refValue = (ElementRefValue) retValue;
		if ( refValue.isResolved( )
				&& value instanceof DesignElementHandle
				&& refValue.getElement( ) != ( (DesignElementHandle) value )
						.getElement( ) )