StyledToggleButton.xaml

<Style TargetType="{x:Type ToggleButton}"> 
<Setter Property="Template"> 
<Setter.Value> 
<ControlTemplate TargetType="{x:Type ToggleButton}"> 
    <Border x:Name="innerBorder"> 
        <!-- Use one JPEG image as the background of ToggleButton --> 
        <Border.Background> 
            <ImageBrush ImageSource="C:\Users\Public\Pictures\Sample Pictures\Tree.jpg" /> 
        </Border.Background> 
    </Border> 
    <ControlTemplate.Triggers> 
        <!-- Change the background image to Dock.jpg when the IsChecked property is True , 
        Otherwise, it will automatically switch to original background image --> 
        <Trigger Property="IsChecked" Value="True"> 
            <Setter TargetName="innerBorder" Property="Background"> 
                <Setter.Value> 
                    <ImageBrush ImageSource="C:\Users\Public\Pictures\Sample Pictures\Dock.jpg" /> 
                </Setter.Value> 
            </Setter> 
        </Trigger> 
    </ControlTemplate.Triggers> 
</ControlTemplate> 
</Setter.Value> 
</Setter> 
</Style>