Jquery week calendar only loads header

Jquery week calendar only loads header

I create a jquery week calendar in a div tag after showing it, i.e. div.show() then #calender.weekCalender();, etc. 

Problem is that when I first show the div I only see the calendar header. If I hide() and go back to show(), I see the calendar load. 

Why might this be happening? 

Thanks for any helpful tips!