Minimize number of forms

Question

Hi :)

I have a software, which contain
several forms that are open at the same time.
And i have caple of problems with it:
1) How can i do that all the forms will minimize
when i minimize the main form ?
2) I have some forms that  supose to be at the top of the screen
all the time (form.topmost) but the problem is
when i go to another program (while my software is open)
those forms are still at the top of the screen, i dont want them
to be at the top when my software lost focus, how can i do it ?
(i tryed to make all the forms.topmost=false, when my main forum
 lost his focus, but its not working :/)

Thanks.