when I add the waitingPopup to my grid,
it works fine, but sumtimes it fails
with a javascript error: 'style' is null or not an object.
This usualy happens when I change the grid datasourse.

Hi Michal,

Thanks for using Syncfusion products.

We are sorry for inconvenience caused. We are unable to reproduce the issue. We have prepared a simple sample and the same can be downloaded from the following links.

Sample link:

http://www.syncfusion.com/downloads/Support/DirectTrac/88248/sample569871673.zip

Could you please try the above sample and get back to us whether you are able to reproduce the issue? If not, could you please give more information or by reproducing the issue in the above sample so that we could sort out the issue and provide you with solution. The information provided would be of great help in resolving the issue.

Please let us know if any concerns.

Regards,
Ranjithkumar