I am using SL 4. I have created a datagrid but I cannot set the Background Color in either the body of the grid or the header.

Here is a snippet of my code;
<Style TargetType="sdkataGridColumnHeader">
<Setter Property="FontFamily" Value="Georgia"></Setter>
<Setter Property="Foreground" Value="Maroon"></Setter>
<Setter Property="FontWeight" Value="Bold"></Setter>
<Setter Property="Background" Value="Maroon"></Setter>

It all works except the background.

Does anyone have any ideas