Hi,
You would use something like this:
Code: C#
//Get the toolbar item
EO.Web.ToolBarItem item = toolbar1.Items[index];
//Get the control from the custom item template
Control control = item.CustomItemInstance.FindControl(drop_down_id);
//Now you can cast control to your specific control type
Hope this helps. Please feel free to let us know if you still have any more questions.
Thanks!