Need help with DataGridColumnStyle

I made this class using this code: http://msdn.microsoft.com/library/de...classtopic.asp as a template - except my version is in VB .NET. I've attached my version to this posting - the main difference is that my columns contain combo boxes instead of a time picker.

However, Visual studio gives me the following error message: The designer must create an instance of type 'System.Windows.Forms.DataGridColumnStyle' but it cannot because the type is declared as abstract.

The really odd thing is the code seems to work regardless. Does anyone know what I need to do to get rid of this error message?