(before anyone asks, the title is right: I have code working only at *design* time in Blend, while the most common by far would be the opposite :o )

While designing a `DataTemplate` in Expression Blend, I can see my `DataTriggers` working fine, my sample ViewModel generates a random value for the level of a battery, and both border width and background color display accordingly, either in the `BatteryLevelTemplate` itself, and another panel containing a lot of devices with their respective (random) battery level, with a design-time DataContext.

Here is a screenshot from Expression Blend:

![enter image description here](https://i.stack.imgur.com/D1mER.png)

And here a screenshot from the running application. Notice that, while both use exactely the same class as DataContext (but as design time in Blend), at runtime only the default RedBattery color setter is applied, even if the value itself (which also affects width) varies:

![enter image description here](https://i.stack.imgur.com/SdxSm.png)

And here are the relevant code parts:

```
                    <Border.Width>
                        <MultiBinding Converter="{StaticResource NormalValueConverter}" FallbackValue="10">
                            <Binding Path="NívelBateria"/>
                            <Binding Path="ActualWidth" ElementName="BatteryChargeContainer"/>
                        </MultiBinding>
                    </Border.Width>
                    <Border.Style>
                        <Style TargetType="Border">
                            <Setter Property="Background">
                                <Setter.Value>
                                    <SolidColorBrush Color="{StaticResource BatteryRed}"/>
                                </Setter.Value>
                            </Setter>
                            <Style.Triggers>
                                <DataTrigger Binding="{Binding NívelBateria, Converter={StaticResource ValorMaiorQue}, ConverterParameter=0.25}" Value="True">
                                    <Setter Property="Background">
                                        <Setter.Value>
                                            <SolidColorBrush Color="{StaticResource BatteryOrange}"/>
                                        </Setter.Value>
                                    </Setter>                                       
                                </DataTrigger>
                                <DataTrigger Binding="{Binding NívelBateria, Converter={StaticResource ValorMaiorQue}, ConverterParameter=0.5}" Value="True">
                                    <Setter Property="Background">
                                        <Setter.Value>
                                            <SolidColorBrush Color="{StaticResource BatteryYellow}"/>
                                        </Setter.Value>
                                    </Setter>                                       
                                </DataTrigger>
                                <DataTrigger Binding="{Binding NívelBateria, Converter={StaticResource ValorMaiorQue}, ConverterParameter=0.75}" Value="True">
                                    <Setter Property="Background">
                                        <Setter.Value>
                                            <SolidColorBrush Color="{StaticResource BatteryGreen}"/>
                                        </Setter.Value>
                                    </Setter>                                       
                                </DataTrigger>
                            </Style.Triggers>
                        </Style>
                    </Border.Style>

```

============

```
        <DockPanel x:Name="PainelSetupsSensores" Background="#FFB8E6E8"/>
        <DockPanel x:Name="PainelSensoresDisponiveis" Background="#FFF0F0F0"
            Grid.RowSpan="2" Grid.Column="1" 
            DataContext="{Binding ReceiverAtivo}"
            d:DataContext="{d:DesignInstance Type=local:ReceiverSimulado, IsDesignTimeCreatable=True}">
            <ScrollViewer>
                <ItemsControl  ItemsSource="{Binding Sensores}" Margin="10">
                    <ItemsControl.ItemsPanel>
                        <ItemsPanelTemplate>
                            <WrapPanel/>
                        </ItemsPanelTemplate>
                    </ItemsControl.ItemsPanel>
                </ItemsControl>
            </ScrollViewer>
        </DockPanel>

```

====================

```
class ValorMaiorQue : IValueConverter
{

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        double valor = (double)value;
        double limite = double.Parse((string)parameter);

        return valor > limite;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

```

UPDATE (using the valuable Snoop tip by Contango):

I "snooped" the `BatteryCharge` (Border) element, and found out an interesting thing:

* The `Width` property, which is affected by a Multi Value Element Binding, is working fine and displays in a "Local", green-shaded row;
* On the other hand, the `Background` property, which is not working, displays unsurprisingly as `Style` with the default red value. This one is not being "DataTriggered".

![enter image description here](https://i.stack.imgur.com/8LQ1D.png)

My doubt now is how I am supposed to use Snoop (or anything else) to find out why the DataTrigger is not being applied.