First of all you need to create a MDI form.
After you have created a MDI form you have to create a child form and finally, at runtime, load the child.
The code should be something like:
Dim child As New mdichild()
child.MdiParent = Me
child.Show()
Now let's go back to the IDE design and add a menu to the MDI form.
Then add an item to the menu, this item will shows up the MDI child forms.
Finally click on the properties of the menu and select:
MDIWindowsListItem and select the item you have created.
That's it!
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