DataGrid images input

[C# Programming]

I want to put little arrows inside a DataGrid to mimic the kind of display shown in this Excel file:

http://i67.photobucket.com/albums/h292/Athono/arrows.png

But the XAML code defines individual columns instead of individual cells:











I can add text into the Datagrid by data binding with an observable collection. But this is text data. What about replacing gaphics? Do I need something extra special?

This is the results of my efforts

http://i67.photobucket.com/albums/h292/Athono/otherarrows.png

I do not need to have the graphic and the text share the same sell. That part can be overlooked. How can I just replace the arrow with a different error within the cell?