How to display xamlcode in my usercontrol
===

I have created user control. I want to display XAML inside my usercontrol. Like that:

	<UserControls:UserControl1 Header="Heading">
			<TextBlock Text="My Content" />
	</UserControls:UserControl1>

Thats the usercontrol:

    <UserControl x:Class="UserControls.UserControl1"
                 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
                 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
                 mc:Ignorable="d" MinHeight="200"
                 d:DesignHeight="300" d:DesignWidth="300">
    	<UserControl.Resources>
    		<Style TargetType="ToggleButton">
    			<!-- ... -->
    		</Style>		
    	</UserControl.Resources>
    	<StackPanel>
    		<Grid>
    			<Grid.ColumnDefinitions>
    				<ColumnDefinition Width="Auto" />
    				<ColumnDefinition Width="*" />
    				<ColumnDefinition Width="Auto" />
    			</Grid.ColumnDefinitions>
    			<TextBlock Text="{Binding Path=Header}" Grid.Column="0" />
    			<ToggleButton Name="ToggleButton" IsChecked="True" Grid.Column="2" />
    		</Grid>
    		<Rectangle Stroke="#c3c3c3" StrokeThickness="1" Height="1" StrokeDashArray="4 4" SnapsToDevicePixels="True" Focusable="False" />
    		<!-- Content -->
    	</StackPanel>
    </UserControl>

Now how can I set the xaml code (e.g. `<TextBlock Text="My Content" />`), in my control?