Hi Gourav,
Sorry for the delay in getting back to you.
I am afraid that I was not able to see the issue of "ToolStripTabItems are not working properly" in the sample. Could you please provide the reproduce steps in the sample attached or send us the sample with the issue, so that we could sort out the problem and provide you the exact solution early?
Here is the sample:
'>http://websamples.syncfusion.com/samples/Tools.Windows/F72801/main.htm"> http://websamples.syncfusion.com/samples/Tools.Windows/F72801/main.htm Here is the video clip:
RibbonControlAdvToolStripTabItem.zipPlease let me know if it helps.
Regards,
Subhasheela R