Then you're writing too much code. Put one call in each base class to a handler that determines if the form is in edit mode or not. If not in edit mode, it shows the message.

At most it's 10-15 lines of code.

>I find out that using repeated lines can be a problem
>
>Some times I create new objects in form and forget the insert the line in this new object
>
>That is why I look for means of do not repeat command lines in several objects