Hi Wedant,
There is no built-in support for changing the layout of the radio button in a grid cell. You can do this by deriving the GridRadioButtonCellRenderer and override OnLayout method to change the look and feel of the radio button cell in a grid. Below is a forum thread that discuss with similar issue.
http://www.syncfusion.com/Support/Forums/message.aspx?&MessageID=64560Best regards,
Haneef