SelectedRow color for data bound datagrid

I have a 2 column datagrid which is bound to a list of key value pairs and I've set an AlternatingRowBackground to Gainsboro. So now the grid has while and gray alternating rows. But when I select one of the rows, the text foreground is set to white and the text in the white rows disappears. 

How do I set a background color property for the whole row.

ajaind