The event arguments used by ComboBox's DropDownClosed event. 
   Namespace:   Autodesk.Revit.UI.Events  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Inheritance Hierarchy
  System Object  
System EventArgs
Autodesk.Revit.UI.Events RibbonItemEventArgs
Autodesk.Revit.UI.Events ComboBoxDropDownClosedEventArgs
 
 System EventArgs
Autodesk.Revit.UI.Events RibbonItemEventArgs
Autodesk.Revit.UI.Events ComboBoxDropDownClosedEventArgs