Answer Posted / satheesh kannan

MenuItem is associated with a single event where as
CheckBoxMenuItem is associated with two events(it is having
a toggle state-enable/disable)

File->open is best example of menu item , it opens a "open
dialog" box when we click this is taken as a single event,

View-->status bar is a checkboxmenuitems, which has two
states, If it "on", the status bar gets displayed in IE,if
we click it again its gets "Off", the status bar is hidden.
(similar to a checkbox)

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