How to change the background color of a grid row in Silverlight

I have a Silverlight grid to which I dynamically add rows.
Based on the value of an object I need to set the background color of that row.

How can I do this programmatically.

<Grid x:Name="gridA" HorizontalAlignment="Left"  Grid.RowSpan="99"  Grid.ColumnSpan="99" VerticalAlignment="Top" ShowGridLines="True" > 
 </Grid>

 
Code behind

                RowDefinition rowDef = new RowDefinition() { Height = GridLength.Auto   };
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countrymeisterAsked:
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