Description of problem:
Perspective layout editor drag and drop does not work in Internet Explorer. After release of item, only red rectangle is shown. Both grid system and component have same issue.

Version-Release number of selected component (if applicable):
6.1.0.ER4

How reproducible:
Internet Explorer 11 on Windows 8.1

Steps to Reproduce:
1. Create perspective layout editor. (Extensions -> Plugin management -> New... -> New perspective layout)
2. Drag grid system item or one of component items and move mouse to column.
3. Release mouse button.

Actual results:
Red rectangle is displayed. Item is not added into column.

Expected results:
Item is added into column.