No Chris, I can check the Leave Event which, when the field looses Focus calls a method "EvaluateInput". This I need to suppress when no key is pressed. Leave or Validating don't detect another object like a button having been pressed because they occur first.
I can trap Key Events like Function or Enter key through System.Windows.Forms.KeyEventArgs, but, not the Tab Key. Latter would allow me to evaluate a KeyPressed Event rather than Leave to do something.