Gets the status of the extra checkbox. 
Namespace: Autodesk.Revit.UIAssembly: RevitAPIUI (in RevitAPIUI.dll) Version: 21.0.0.0 (21.1.1.109)
Since: 2017
Syntax
| C# | 
|---|
public bool WasExtraCheckBoxChecked()  | 
| Visual Basic | 
|---|
Public Function WasExtraCheckBoxChecked As Boolean  | 
| Visual C++ | 
|---|
public: bool WasExtraCheckBoxChecked()  | 
Return Value
Whether the extra checkbox is checked.
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions..::..InvalidOperationException | Thrown when the task dialog does not have an extra checkbox or the task dialog is not shown yet. |