I have a window MDI with menu this floow

I wanna show MENU popup when i click right button in window MAIN, in this menu
i wanna show item ( Windows ) and inside this item show submenu with
all mdi files opened
how make this ?

I wanna show MENU popup when i click right button in window MAIN, in this menu
i wanna show item ( Windows ) and inside this item show submenu with
all mdi files opened
how make this ?