TIMOB-17843-Added code to open the picker while selecting the row

Open picker while selecting the row

https://jira.appcelerator.org/browse/TIMOB-17843

Both TiUINativePicker and TiUISpinner extend this class and this is applicable only for TiUINativePicker. Since this is not applicable for all the derived classes, it makes sense to have a default implementation in the base class.