>The reason for such a work is that we want to iconize the entire app when the user chooses the iconize button onto a simple background form.

I'm not sure what you mean here. What "simple background form"? The main MDI form? Do you mean when the user chooses to minimize a MDI child form, you want to minimize the whole application (the main MDI form)? What do you mean by "iconize"? I assume you mean minimizing it.

>If we have a non MDIChild form displayed, and if it's modal (since we want to have only one active form at a time), the app could not be reduced.

So you want the app "reduced" (I'm assuming minimized here) for a modal form in a MDI application?

jody