I copied a screen and therefore its dialog to create a new screen.

However, the dialog (netexpress) is not working the same for the new screen

In the original, when a push button is selected, there is a Validate $windows that sets off the Val-error event if a blank category is entered.  This does not happen in the copied window, although it also invokes Validate $windows (apparently it finds no error).  Where/how do I find the validation that is actually being done in the first case?  In both cases, we have an error file as a resource.