Switch images with a data template - wpf

Question

I know that already some questions exist but I can not fix my problem with them.
Problem: I try to change a image with a data template but just the default image is visible.
Code:
My xaml code is like this:
<Window.Resources>
<DataTemplate x:Key="MultiTemplate">
<Image Height="17" Width="17">
<Image.Style>
<Style TargetType="{x:Type Image}">
<Setter Property="Source" Value="{svg2Xaml:SvgImage VideoControllerTester;component/Resources/Start.svg}"/>
<Style.Triggers>
<DataTrigger Binding="{Binding MultiTrigger}" Value="start">
<Setter Property="Source" Value="{svg2Xaml:SvgImage VideoControllerTester;component/Resources/Start.svg}"/>
</DataTrigger>
<DataTrigger Binding="{Binding MultiTrigger}" Value="stop">
<Setter Property="Source" Value="{svg2Xaml:SvgImage VideoControllerTester;component/Resources/Stop.svg}"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>
</DataTemplate>
</Window.Resources>
<ContentControl ContentTemplate="{DynamicResource MultiTemplate}"/>
In the code behind I set MultiTrigger = "start" or "stop".
Question: Can I show the images with the content control? Or I do some dumb stuff with the data template?
Edit:
public string MultiTrigger
{
get { return _multiTrigger; }
set
{
_multiTrigger = value;
RaisePropertyChanged();
}
}

Answer 1

Assuming that there is a MainViewModel class with a MultiTrigger property (which btw. is a strange property name), you would assign an instance of the view model class to the MainWindow's DataContext, either in code behind:
public MainWindow()
{
InitializeComponent();
DataContext = new MainViewModel();
}
Or in XAML:
<Window.DataContext>
<local:MainViewModel/>
</Window.DataContext>
Then you would declare the Image Style as a resource:
<Window.Resources>
<Style TargetType="Image" x:Key="ImageStyle">
<Setter Property="Source" Value="{svg2Xaml:SvgImage VideoControllerTester;component/Resources/Start.svg}"/>
<Style.Triggers>
<DataTrigger Binding="{Binding MultiTrigger}" Value="stop">
<Setter Property="Source" Value="{svg2Xaml:SvgImage VideoControllerTester;component/Resources/Stop.svg}"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Window.Resources>
and apply it to an Image control:
<Image Style="{StaticResource ImageStyle}"/>
Then change the property value somewhere in the MainWindow's code behind by directly accessing the view model instance like this:
((MainViewModel)DataContext).MultiTrigger = "stop";