Is it possible create custom control for dropdowncheckboxes

Question

In my asp.net web application, i am using Saplin.Controls of dropdowncheckboxes and i need to display dropdowncheckboxes selected items in selectionbox but i need to create custom control to dropdowncheckboxes.Is it possible to do and how to do this i don't know about custom control can anyone give idea about this.

 

 

Thank you