Hi Poonam,
My collegue has already answered your other post on the matter, so you can continue your discussion with him them. Below is the link for the other thread for anyone interested in the same topic:
https://www.telerik.com/forums/radgrid-header-context-menu-columns-option-s-submenu-can-t-display-very-well
Regards,
Vessy
Progress Telerik
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