GridDropDownColumn dynamic loading records

[Rajendra]

I have created few GridDropDownColumn in my page in design of the page with the properties of 

<telerik:GridDropDownColumn DataField="Department_Name"
                    FilterControlAltText="Filter ddlDepartment column" HeaderText="Department"
                    UniqueName="ddlDepartment" ListDataMember="Department" ListTextField="Department_Name" ListValueField="Department_Id">
                </telerik:GridDropDownColumn>

I don't want to use DataSourceId to define from the design of the page since I need to load the records in the loading time of the grid and I am using data layer to call the department table records. I have already created the function in data layer which returns all department records in data table.

Same as I need to do for Job Title and Location. I think I need to load these griddropdowns before loading the records in Grid. I read the http://www.telerik.com/help/aspnet-ajax/grid-customize-configure-griddropdowncolumn.html page but still it didn't help me.

[Elliott]

I posted code (in VB) to populate a GridDropDownColumn (RepGroup) at
http://www.telerik.com/community/forums/aspnet-ajax/grid/binding-radcombobox-to-radgrid.aspx