Failed to add validation event handler

I am trying to learn ValidationWalkthrough. When I double click on Quantinity column the following error occurs:

Failed to add validation event handler because of the following error:
Invalid Index. (Exception from HRESULT: 0x8002000B (DISP_E_BADINDEX))

The system is:

Microsoft Visual Studio 2005 Version 8.0.50727.42 (RTM.050727-4200) Microsoft .NET Framework Version 2.0.50727

Installed Edition: C# Express Microsoft Visual C# 2005 76544-000-0000011-00126

What I am doing wrong

Marek




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Failed to add validation event handler