Calendar and Combo popup at the bottom of a page problem

Hello, we have a problem:
when calendar or combo item is located at the bottom of the page - its popup is truncated when clicked.
Here are pictures illustrating this behavior:

Select item works as expected - when there is no place for popup under select item - it popups above.

Could you provide us completed demo to reproduce the issue? … leted_demo

Thank you for attention,
Here is completed demo to reproduce the problem. You can see “Start Date” calendar and “Address Region” combo popups being truncated. (623 KB)

So, send a fix for you

In current 3.6 version this issue was resolved.
dhx_upd.rar (209 KB)