Hi,
Thank you for posting your query to us.
I am afraid that I was not able to reproduce the issue. Please refer to the following steps that I tried to
reproduce it.
1. Add the GridWebControl in the Flow Diagram sample
2. Run the sample
3. Move the mouse over the GridWebControl
Also I have created a simple sample to test this issue and it is available in the following link.
http://websamples.syncfusion.com/samples/Diagram.Windows/5.1.0.51/36554/main.htmPlease have a look at the above sample and if still the issue exists, could you please try reproducing it
in the above sample or send us the reproducing steps so that we could sort out the cause of the issue
and provide you a solution?
Regards,
Sarathi