Hello Rajesh,
Thank you for writing.
RadPropertyGrid supports editing collections through the same popup editor as the standard property grid. I tested the grid with an object containing a properties of type List<T> and arrays and all worked as expected. Therefore I would kindly ask you to provide some more information on the object whose properties you are displaying in the property grid. This will allow me to further investigate your case and provide you with appropriate support service.
Looking forward to your reply.
All the best,
Ivan Petrov
the Telerik team