How do I...bind dropdownlist with otherdropdown list.

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C#

C#4.0

Telerik

Hello,

I am working on telerik Winform with c#.

I have 3 dropdownlist, named as Client Dropdownlist, UserdropdownList,Lawyer DropDownlist.

Here When I select any item from Client Droplsit then according to userdropdownList and LawyerDropDownlist has to be changed.

I can get the List of Lawyer as Fully but i want to show the lawyer as for selected Client.
How should i write code.
My Code as Below.

LawyerDropdownlist.DataSource = Lawyers;
           LawyerDropdownlist.DisplayMember = "LawyerName";
           LawyerDropdownlist.ValueMember = "LawyerId";

here Lawyers show me the full list of Lawyer but i want only selected.
Help

thanks