An MDI child form is a regular form whose MdiParent property points to its MDI container form, so the code that creates and displays a child window is very simple:
Sub ShowMdiChildWindow() ' Display the MenuForm form as a child of this form. Dim frm As New MenuForm() ' Make it a child of this MDI form before showing it. frm.MdiParent = Me frm.Show()End SubA form that can be used either as a regular form or an MDI child form might need to determine how it’s being used. It can do that by testing its MdiParent property or its read-only IsMdiChild property.You can list all the child forms of an MDI parent by using the Form array returned by its MdiChildren property:
Dim frm As FormFor Each frm In Me.MdiChildren Debug.Write(frm.Text)Next
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