c# - Different style for groups in WinRT app -

in app on main page have 3 groups (sampledatagroup) , each group has 1 item. now, groups use standard250x250itemtemplate style.

how can use different style each group?

does switch styles in code?

for e.g

    if (somecondition)     {//use styleone}      else      { //use styletwo}