It's odd that I did the same thing yet I never get the BeforeExitEditMode event; are you certain you're not doing anything programmatically?  One thought would be to override the OnClosing method of the form and to programmatically exit edit mode, i.e.:

 protected override void OnClosing(CancelEventArgs e)
{
    base.OnClosing(e);

    if (e.Cancel == false && this.ultraTextEditor1.Editor.IsInEditMode)
        this.ultraTextEditor1.Editor.ExitEditMode(true, false);                
}

-Matt

Yes, that's right. The CancelButtons causes the exit of the edit mode.

I have tested a little bit with the "IsForceExit"-Flag. This flag is never true, even if I exit the application.

My problem, how I can cancel the edit is still open.

Is there a button that is the CancelButton of your modal dialog?  I haven't been able to get the (Before|After)ExitEditMode events to fire when pressing Esc on a modal dialog this way, so it's harder for me to track down what you can do about this.  My guess is that the editor is getting a notification that it *has* to exit edit mode in this case, so it's going to try to commit the changes; does the IsForcingExit flag help you in this case?

-Matt

Oh, yes you are right. That's my false.

 The "BeforeExitEditMode" events fires because the modal form closes. And than it exit edit mode.

Now I have to reformulate my problem: Is there a possibility to set the "ApplyChanges" flag?

I had like to have the following behavior: If the user did a wrong entry and don't wants to correct his entry, I want cancel the edit operation and set the original value. Has the ultratextbox something like that build in or have I to do this on my datasource?