The default button for the dialog. 
Namespace: Autodesk.Revit.UIAssembly: RevitAPIUI (in RevitAPIUI.dll) Version: 21.0.0.0 (21.1.1.109)
Since: 2011
Syntax
| C# | 
|---|
public TaskDialogResult DefaultButton { get; set; }  | 
| Visual Basic | 
|---|
Public Property DefaultButton As TaskDialogResult Get Set  | 
| Visual C++ | 
|---|
public: property TaskDialogResult DefaultButton { TaskDialogResult get (); void set (TaskDialogResult value); }  | 
Remarks
If DefaultButton is TaskDialogResult.None or its value does not correspond to any CommonButton or CommandLink in the dialog, 
then the first button in the dialog will be the default.