Clear MenuItem, with clear command

Question

hi i'm a "very" beginner in wpf i'm trying to make a menu item "Clear", it should clear the text in the focused text box, actually i could not find a built in command that does the job like (copy,paste,cut..etc)

is there one built in or do i have to make a custom routed command, and if so i've tried but failed, and need ideas

i've made the ClearCommandExecuted logic, but the problem is with "CanExecute" i tried to access the Keyboard.FocusedElement there, but failed because the focused element is the menu item it self when it's clicked !!!!

please help thanks