Use any DataTemplate as an Adorner in WPF

<Window
	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
	xmlns:ed="http://schemas.microsoft.com/expression/2010/drawing" 
    xmlns:Custom="http://schemas.microsoft.com/expression/2010/interactivity" 
    xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
	xmlns:CaControlTestApp="clr-namespace:CaControlTestApp"
	xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
	x:Class="AdornerBehaviorSample.MainWindow"
	x:Name="Window"
	Title="MainWindow"
	Width="640" Height="480">
    
	<Window.Resources>
    
        <!-- Template used in Adorner -->
        <DataTemplate x:Key="AdornerDataTemplate">
            <Grid>
                <StackPanel Orientation="Horizontal" HorizontalAlignment="Left" VerticalAlignment="Top">
                    <Image Height="32" Width="32" Source="Mail-add.png"/>
                    <Image Height="32" Source="Paper-pencil.png" Width="32"/>
                    <Button Style="{DynamicResource SimpleButton}" Width="32" Height="32">
                        <Image Height="Auto" Source="Exclamation.png" Stretch="Fill"/>
                    </Button>
                </StackPanel>

                <TextBlock VerticalAlignment="Bottom"
                           HorizontalAlignment="Left" Text="{Binding Path=SampleString}"/>

                <Image Source="Pencil.png"
                       VerticalAlignment="Bottom"
                       HorizontalAlignment="Right"
                       Width="32" Height="32" />
            </Grid>
        </DataTemplate>

    </Window.Resources>

    
    
    
    
    <!--  Control -->
	<Grid x:Name="LayoutRoot">
		<AdornerDecorator Width="250" Height="250">
			<ed:Arc x:Name="arc" ArcThickness="1" ArcThicknessUnit="Percent" 
                    EndAngle="333" Stretch="None" StartAngle="-257" 
                    Stroke="#FF999292" StrokeThickness="5" RenderTransformOrigin="0.5,0.5">

                <ed:Arc.Fill>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#FFCEFF00" Offset="0"/>
                        <GradientStop Color="#FFFF8D4A" Offset="0.816"/>
                    </LinearGradientBrush>
                </ed:Arc.Fill>
				
				<Custom:Interaction.Behaviors>
					<CaControlTestApp:CaAdornerBehavior AdornerTemplate="{StaticResource AdornerDataTemplate}">
						<Custom:Interaction.Triggers>
							<Custom:EventTrigger SourceName="arc" EventName="MouseEnter">
								<Custom:InvokeCommandAction CommandName="ShowAdornerCommand"/>
							</Custom:EventTrigger>
							<Custom:EventTrigger SourceName="arc" EventName="MouseLeave">
								<Custom:InvokeCommandAction CommandName="HideAdornerCommand"/>
							</Custom:EventTrigger>
						</Custom:Interaction.Triggers>
					</CaControlTestApp:CaAdornerBehavior>
				</Custom:Interaction.Behaviors>
                
			</ed:Arc>
		</AdornerDecorator>
	</Grid>
</Window>