Passing object to the constuctor of Entity Class with adding new item from DataForm!

Question

hi,

here is my case , i want to assign roles to my employees. All Roles are need to be sent to the constructor of the employee class when a user clicks + sign on the top of dataform(Silverlight toolkit 2009).

if i put a break point on the default constructor , it gets hit. so i just want the dataform to send this collection when ever it creates new employee.

thanks

Jamal.