# `GSCallbackHandler addCustomParameterSheetController:forParameter:`

*Type Method*

add class of window controller that handles UI for parameterName

## Declaration

```swift
class func addCustomParameterSheetController(_ propertyDialogClass: AnyClass, forParameter parameterName: String)
```

```objc
+ (void) addCustomParameterSheetController:(Class) propertyDialogClass forParameter:(NSString *) parameterName;
```

```python
addCustomParameterSheetController_forParameter_(propertyDialogClass: type, parameterName: str)
```