protected void onRootChoiceUpdate(final AjaxRequestTarget target) {
		childTextField.setModelObject(getModelObject().getSelectedChildOption());
		target.add(DropdownAutocompleteTextFieldPanel.this.childTextField);
	}
protected void onRootChoiceUpdate ( final AjaxRequestTarget target ) { childTextField . setModelObject ( getModelObject ( ) . getSelectedChildOption ( ) ) ; target . add ( DropdownAutocompleteTextFieldPanel . this . childTextField ) ; }
Callback method that can be overwritten to provide an additional action
when root choice has updated.

@param target
the current request handler