Returns the access key asociated with the menu item.
The AccessKey property syntax has these parts:
||An object expression that evaluates to a SmartMenuList object.
||A numeric expression that evaluates to a menu item.
Every menu item can have an access key. These are defined on the Caption
property by preceding a letter with the symbol &. Access keys are a
quick way of selecting menu items and have always the syntax ALT+Key.
"keyFile", , , "E&xit", , vbAltMask, vbKeyQ
The access key for the example above would be