Grid Class and other column types

Hi,

I would like to know several things about the Grid class from
System.Windows.Controls :

1. Can we define new types of columns (e.g. columns only with SpinBoxes,
or Progressbars, or comboboxes, ...) ?
if yes, how ?

2. If point 1 is possible, how can we sort items contained into cells of
those additional columns ?

thanks a lot,

RAF