Is there any reference on how to add additional methods to IG controls?
You can try this way :
// If you dont need to call original method $.widget("ui.addresspicker", $.extend({}, $.ui.addresspicker.prototype, { _updatePosition: function(){ // Do what you want to } })); // If you need to call original method var _updatePosition = $.ui.addresspicker.prototype._updatePosition; $.widget("ui.addresspicker", $.extend({}, $.ui.addresspicker.prototype, { _updatePosition: function(){ // Do what you want to // Call original widget method _updatePosition.apply(this, arguments); } }));