Gets or sets the System.Windows.Forms.ToolStripMenuItem that is used to display a list of Multiple-document interface (MDI) child forms.
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Use the MenuStrip.MdiWindowListItem property to designate or discover which System.Windows.Forms.ToolStripMenuItem displays MDI children.
Use the MenuStrip.MenuActivate and MenuStrip.MenuDeactivate events on child menus to reflect changes to the value of MenuStrip.MdiWindowListItem.