Acessing TextBox (within GroupFooterTemplate) parent from codebehind

Hello,

I'm using a RadGridView, and in it's footer, a textbox element inside a GroupFooterTemplate. Can I, from codebehind, in a TextBox event (e.g. TextChanged) somehow access the GridView that contains my TextBox? When I check the sender's properties, the parent is null.

Also, can I somehow access the group information and the other groups' TextBoxes?

Any help would be appreciated.