Hi Yuval,
Thank you for your interest in Syncfusion Products.
I am afraid that i'm not able to reproduce the reported issue, could you please refer the following simple sample.
http://websamples.syncfusion.com/samples/Tools.Windows/F76003/main.htmIf I am missing anything, could you please send us a sample or video file so that we could sort out the cause of the issue and provide you a solution?
Please let me know if any concerns.
Regards,
Hema