code: function(actionData) {
  						// unbinds the old binding
  						controlInstance._bindings.control[methodName](controlInstance.element);
  						// binds the new
  						controlInstance._bindings.control[methodName] = actionData.processor(
  							actionData.delegate || controlInstance.element,
  							actionData.parts[2], actionData.parts[1], methodName, controlInstance);
  					}
docs: Create a handler function that we'll use to handle the `change` event on the `readyCompute`.