Hi Gourav,
Thank you for your interest in Syncfusion Products.
I am afraid that I was not able to reproduce the issue mentioned here. Please find the simple sample in the following link that dynamically created ToolStripEx and added to the RibbonControlAdv:
http://websamples.syncfusion.com/samples/Tools.Windows/F72858/main.htmPlease find the videoclip in the following link that displays all the ToolStripEx items correctly when it is clicked first time:
http://websamples.syncfusion.com/samples/Tools.Windows/F72858/videoclip.zipPlease look at the above sample, if the issue still persists, could you please modify the above sample and send us, so that we could work in depth and provide you a better solution?
Please let me know if any concerns.
Regards,
Fathima