Footer text in datagrid dont apply the changes in code behind

I have a datagrid with a text footer, and wanted to change the text in this footer when change selection in dropdownlist, but this change is not visible on the client(browser). I've been doing some tests and if i use the databinding() method datagrid is updated, and the text is correct.

My qu开发者_高级运维estion is how to force the table to be drawn with the new changes. I think what the databinding() method is redrawing the datagrid, in the browser.