wpf datagrid questions

Question

I am new to wpf/.net (old school vb6).
I need to fill a datagrid.(that is no proglem), by issue is this.
first col is a name the second, third..... are a value of Pass or Fail.
What i need to do is if the value is Pass then I want a button in that col/row to be Green
if the value is Fail then i need a button to be Red.
I was pointed to converters but i have no clue, any direction would be great.
 
Lee