+ addCustomParameterViewClass:forParameter:
+ addCustomParameterSheetController:forParameter:
add class of window controller that handles UI for parameterName
+ (void)addCustomParameterSheetController:(Class)propertyDialogClass forParameter:(NSString *)parameterName
add class of view controller that handles UI for parameterName
+ (void)addCustomParameterViewClass:(Class)parameterClass forParameter:(NSString *)parameterName