[Gambas-user] Replace (Internal) Error Message

[Hans Lehmann]

Hello.

When I use the following procedure:

Public Sub dcFlowername_Validate(Value As Variant)

      If IsNull(Value) Then
     '-- Message.Warning(Subst("&1<br>&2<b> &3 </b>&4", ("No flower name 
was entered!"), ("The data set is"), ("not"), ("saved!")))
     '-- An *internal* error message is displayed!
         Return
      Endif

End

the same meaningless error message "Invalid value" is always displayed.

Is there a way to replace this internal error message with a meaningful 
error message of my own?

With kind regards

Hans
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