The event arguments used by the DialogBoxShowing event when a Windows message box is about to be displayed in Revit. 
   Namespace:   Autodesk.Revit.UI.Events  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2010 
Syntax
| C# | 
|---|
   |  
| Visual Basic | 
|---|
   |  
| Visual C++ | 
|---|
   |  
Remarks
 When the application receives this object, a simple message box is about to be displayed in Revit that requires user interaction. The OverrideResult function can be used to cause the dialog to be dismissed and return a desired result code. 
 Inheritance Hierarchy
  System Object  
System EventArgs
Autodesk.Revit.DB.Events RevitAPIEventArgs
Autodesk.Revit.DB.Events RevitAPIPreEventArgs
Autodesk.Revit.UI.Events DialogBoxShowingEventArgs
Autodesk.Revit.UI.Events MessageBoxShowingEventArgs
 
 System EventArgs
Autodesk.Revit.DB.Events RevitAPIEventArgs
Autodesk.Revit.DB.Events RevitAPIPreEventArgs
Autodesk.Revit.UI.Events DialogBoxShowingEventArgs
Autodesk.Revit.UI.Events MessageBoxShowingEventArgs