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grab: the grab commands

value all_current : unit ->widget list 
tk invocation: grab current
value current : widget -> widget list 
tk invocation: grab current widget
value release : widget -> unit 
tk invocation: grab release widget
value set : widget -> unit 
tk invocation: grab widget
value set_global : widget -> unit 
tk invocation: grab -global widget
value status : widget -> grabStatus 
tk invocation: grab status widget

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