validation for date picker and combo box

I need to expand the contact.html example you provide by adding a date picker and combo box of choices with "required" class. Adding the elements themselves is easy, but I'm having trouble adding their validation (date picker shouldn't be blank, and combo needs to select something other than first choice). When I add the regular bootstrap validation elements, they seem to conflict with the built-in sm-form-control classes Canvas provides. Do you have any examples of how to add validation to date picker and combo box to the same page as your contact demo, using the same sm-form-control classes?

Thanks ...