[vtkusers] Question with "AddObserver" from C# Kitware.VTK

[samuelhu]

Hello:
   recently,i have an Question with  "AddObserver" from C# Kitware.VTK.
   i want to make a pick operation, so i  use the "AddObserver" command,but
it's always show errors the following messages: 
error	16	parameter 2: can't translate “methods” to “Kitware.VTK.vtkCommand”
D:\VTK\testVTK\Form1.cs	625	71	testVTK

the program line like this:
 iren.AddObserver((uint)vtkCommand.EventIds.KeyPressEvent,KeyPressVtk,
0.01f);

note:   
 public void KeyPressVtk(vtkObject caller, uint eventId, object clientData,
IntPtr callData)
        {
            string key = iren.GetKeySym();
            switch (key.ToLower())
            {
                case "h": 
                    if (listPickerActors != null)
                    {
                        if (listPickerActors.Count > 0)
                        {
                           ....
                        }
                    }
                    break;
                case "c": 
                    //ClearPickers();
                    break;
                default:
                    break;
            }
            iren.Render();
        }



but,i make it when i use the "VTK-5.0.1-wrap-1.1",it's also make program
with C#
<http://vtk.1045678.n5.nabble.com/file/n5728144/QQ%E6%88%AA%E5%9B%BE20140808105258.png> 

so,can you tell me ,how to use the "AddObserver" in C# Kitware.VTK.  and
make pick operation



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