GridViewComboBoxColumn Selection with Keyboard Key ?

Hi , i build a gridview + some lookup boxes with GridViewComboBoxColumn

all working well but i missing some functionality i could not find how todo.

If the GridViewComboBoxColumn is open and i have a long Listing of Countries i want to jump to the first Item starting with "F*" if i press e.g. "F" on the Keyboard.

Is there a XAML only solution , because i use MVVM ?

thanks for tips

regards