Closed Issue: Calendar closes when I click on the scroll bar [14940]

Calendar closes when I click on the scroll bar, it is necessary to click on the scroll to view the rest of the Calendar when overflow the page.

Steps to reproduce issue:
1 - click on the button calendar
2 - click on the scrollbar.
Comments: This ticket was filed for a pre-15.1 version of AJAX Control Toolkit. If this is still an issue in v15.1 or later, please create a new inquiry.