wyzwalacze danych wpf

<StackPanel>
<StackPanel.Resources>
<Style x:Key="stylKwadrat" TargetType="Rectangle">
<Setter Property="Margin" Value="10"/>
<Setter Property="Fill" Value="LightBlue"/>
<Setter Property="Width" Value="30"/>
<Setter Property="Height" Value="30"/>
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=cbOn,
Path=IsChecked}" Value="True">
<Setter Property="Fill" Value="Red" />
<Setter Property="Width" Value="50"/>
<Setter Property="Height" Value="50"/>
</DataTrigger>
</Style.Triggers>
</Style>
</StackPanel.Resources>
<CheckBox x:Name="cbOn" Content="Zmień kolor i rozmiar" Margin="5"/>
<Rectangle Style="{StaticResource stylKwadrat}"/>
</StackPanel>