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<Image Grid.Column="2" Stretch="None">
<Image.Style>
<Style TargetType="{x:Type Image}">
<Setter Property="Source" Value="..\..\Images\OK.png" />
<Style.Triggers>
<DataTrigger Value="True" Binding="{Binding TimeSheet, Converter={StaticResource overQuotaConv}}">
<Setter Property="Source" Value="..\..\Images\Error.png"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>