Hi Vik,
Sorry for the delay in updating you.
I could see this issue. Could you please try to set the RowIndex property for rearranging toolbar in runtime?
Please refer to the attached sample and let me know if this is helpful for you.
http://websamples.syncfusion.com/samples/Tools.Windows/F59444/main.htmThanks for your interest in Syncfusion products.
Best Regards,
Poly