How to set child forms maximized, last childform minimized

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C#

C#4.0

Hi,

I am working on Mdiforms, I took menustrip with one menustrip item(parent form), in that i took 3 child forms. when I open child forms those forms fit into parent form(child form maximize window). when i open childforms and close those child forms one by one there is no problem, all forms are maximized window size.

problem: when i open no.of childforms, the last childform is minimized the remaining
childforms(before open last childforms) are goes to normal window size(not in
maximum window size).

Que: how to maximize Child windows, not only childforms closing, even childforms minimized also(all child forms are maximized only even closed or minimized).