JQueryUI Datepicker Hidden

I’m using the tabbar and loading content into iframes dynamically. I’ve added a jquery ui datepicker to some of the pages. On some of the pages the calendar triggered by the datepicker is hidden within the iframe. I’ve attached a screen shot. Has anyone come across something similar? I appreciate any help. Thanks.

If you use small iframe area (or datepicker on its bottom) - datepicker will be hidden under ifrave viewport scale.