Vista - Detect If Control Contains Property

How can I detect if a control contains a property. Need to use reflection
somehow?

If ctl.ContainsProperty("Tag") Then ctl.Tag = "some tag information"

Derek Hart wrote:
Why do you need to?

You can /ask/ any Control (or, indeed, any Object) what Type it is, and
then process it accordingly, as in

Sub Click( sender as Object e as EventArgs )

If Typeof sender is CheckBox Then
With DirectCast( sender, CheckBox )
.Text = .Text.ToUpper()
.CheckState = CheckedState.Checked
End With

Else If Typeof sender is TextBox Then
With DirectCast( sender, TextBox )
.Text = .Text.ToLower()
End With

End If
End Sub
If you /really/ must, but it's more difficult and (I would expect) quite
a bit slower as well.

HTH,
Phill W.