Occurs when the drop-down list of the export list control is opened. 
            
    Namespace: 
   PerpetuumSoft.ReportingServices.Viewer.ClientAssembly: PerpetuumSoft.ReportingServices.Viewer.Client (in PerpetuumSoft.ReportingServices.Viewer.Client.dll) Version: 1.0.0.0
Syntax
| C# | 
|---|
public event RoutedEventHandler DropDownOpened  | 
| Visual Basic (Declaration) | 
|---|
Public Event DropDownOpened As RoutedEventHandler  | 
| Visual C++ | 
|---|
public: event RoutedEventHandler^ DropDownOpened { void add (RoutedEventHandler^ value); void remove (RoutedEventHandler^ value); }  |