Datagrid property as a string List

Hello i have a property it is string list. When i wrote like this
RadzenDataGridColumn TItem="UserRoles" Property="MenuRightsList" Title="Roles"
output looks like this System.Collections.Generic.List`1[System.String]. This should show users own roles in one row i can't figured out how can i do this. Is there any way to do it ?

ıt should look like = username | roleA, roleB, roleC, roleD

Thank you for your all answers.

You can either declare Template for this column where you can write custom code to represent your property value in the way you need or you can add additional property to your model that will return the original value as coma or slash separated string and bind the column to this property.