Style setters

demo.xaml

<Style x:Key="infoLabelStyle" TargetType="Label">
  <Setter Property="TextColor"       Value="Green"   />
</Style>

<Style x:Key="testStyle" TargetType="Label">
 <Setter Property="TextColor"       Value="Red"   />
</Style>

<Label x:Name="totalOutput" Text="0.00" Style="{StaticResource infoLabelStyle}" Grid.Row="2" Grid.Column="1">
  <Label.Triggers>
         <DataTrigger TargetType="Label"
           Binding="{Binding Source={x:Reference sw}, Path=IsToggled}" Value="true">
              <Setter Property="Style" Value="{StaticResource testStyle}" />
          </DataTrigger>
  </Label.Triggers>
</Label>