To define if a method has to have a tick mark (check) in the menu, IsChecked prefix is used before the method name:

  <ShellCommand(CanExecute:="Ena_IsWindowActive", IsChecked:="Chk_IsGuidesLocked")> _

  Public Sub RifLock()

    Page.RifLock(SwitchToggle)

  End Sub

The checker function is a custom function, in the above example its code is:

  Public Function Chk_IsGuidesLocked() As Boolean

    Return Page.IsGridLocked()

  End Function

See also

Enabling methods (in menus and keys)