RadGrid Dyanmic Dropdown in Batch Mode

Here is my scenario

I have two grid and two buttons and layout is as follows

UI :

1. Student_Grid <Student Name, Student ID, Select Checkbox> : Student Info Grid

2. Move Button : Button which will Copy Selected Students from Student_Grid to Notice_Grid

3. Notice_Grid<Student Name, Student ID, some columns, Hobbies_dropdownlist>

4. Submit  Button : which will send data to server.

DataTable :

1. Student_data <master>

2. Hobbies_data <master>

3. Student_hobbies <relationship table>

Requirement :

User will select few students from Student_Grid and use Move button to copy those to Notice_Grid where user selects Hobbies (which is different for different students)

Problem:

I am creating datatable in aspx.vb page and then binding that data to Notice_Grid. Problem is, I m not able to populate dropdownlist datasource since, it is dynamic. I tried different ways but didnt find way to assign datasource to dropdownlist/combobox based on studentid. each row could have different list under hobbies column.

Thanks in advance

Note: I am using Radgrid with Batch mode