Returns true if given source data is known (can be null, but the property has to be registered).
            
Namespace: CMS.MacroEngineAssembly: CMS.MacroEngine (in CMS.MacroEngine.dll) Version: 8.0.0.0 (8.1.5347.20411)
Parameters
- selector
 - Type: 
System String
Selector 
Return Value
Type:See Also