fix the position of RadComboBox when resize window

[hosi]

hello

I am trying to a combo box stays fixed.

but when I'm resizing window, the combo box moved horizontally.

(you can see my situation in this url when resizing window. -> http://demos.telerik.com/aspnet-ajax/combobox/examples/overview/defaultcs.aspx)

how can I fix the combo box regardless of window?

thanks in advance.