Create a control in Resources and reuse it in XAML WPF

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When you define a arbitrary Control in Resources, you can use it in the future in Control which have property Content and derived from Control class. These are the followings: ContentControl, Label, ContentPresenter, etc.

Also you must set x:Shared="False" for resource if you want to use this resource in many Controls, because x:Shared="True" by default then one Resource is common to all – in this case, the system swears on the duplicate Content. When x:Shared="False" when is created Resource for each element whenever it its request. Quote from MSDN:

When set to false, modifies WPF resource-retrieval behavior so that requests for the attributed resource create a new instance for each request instead of sharing the same instance for all requests.

Example:

<Window.Resources>
    <Canvas x:Key="Ampel" x:Shared="False">
        <Rectangle Fill="Black" HorizontalAlignment="Left" Height="52" Stroke="Black" VerticalAlignment="Top" Width="50"/>
        <Ellipse x:Name="RedGreen" Fill="Red" HorizontalAlignment="Left" Height="27" Margin="11,12,0,0" Stroke="Black" VerticalAlignment="Top" Width="28" />
    </Canvas>
</Window.Resources>

<Grid>
    <ContentControl Name="MyContentControl" Content="{StaticResource Ampel}" HorizontalAlignment="Left" />        
    <Label Name="MyLabel" Content="{StaticResource Ampel}" HorizontalAlignment="Center" />
    <ContentPresenter Name="MyContentPresenter" Content="{StaticResource Ampel}" HorizontalAlignment="Center" VerticalAlignment="Center" />
</Grid>

To change the Fill of Ellipse in code-behind, you can like this:

private void ChangeBackground_Click(object sender, RoutedEventArgs e)
{
    var canvas = MyContentControl.Content as Canvas;

    if (canvas != null)
    {
        foreach (var item in canvas.Children)
        {
            if (item is Ellipse)
            {
                ((Ellipse)item).Fill = Brushes.Green;
            }
        }
    }
}

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