code: function(proto, combos) {
  		var root = document.documentElement;
  		gui.Object.each(combos, function(name, combo) {
  			this._docombo(proto, name, combo, root);
  		}, this);
  	}
docs: Private ................................................................... 
  Overloading prototype methods and properties.
  @param {object} proto
  @param {Window} win
  @param {Map<String,function} combos