. , , . , Checked True, :
Checked Boolean, , , . , Checked True. Checked False , CheckState CheckState.Checked, CheckState.Unchecked Checkstate.Indeterminate.
, , CheckOnClick True. , . , ToolStripMenuItem CheckState ToolStripMenuItem.Checked.
, . Separator , . 9-2.
, , ToolStripSeparator MenuStripItems, :
, Alt . , File F , Alt+F File , , , , , . , , . , Open, File, File, .
, , , (&). , Alt+F File Text FileToolStripMenuItem &File.