Add Rectangle to ContentControl C# wpf

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I have a Xaml Code in My Project Like This:
Window.Resources

!-- MoveThumb Template --
ControlTemplate x:Key="MoveThumbTemplate" TargetType="{x:Type local:MoveThumb}"
Rectangle Fill="Transparent"/
/ControlTemplate


!-- ResizeDecorator Template --
ControlTemplate x:Key="ResizeDecoratorTemplate" TargetType="{x:Type Control}"
Grid
local:ResizeThumb Height="3" Cursor="SizeNS" Margin="0 -4 0 0"
VerticalAlignment="Top" HorizontalAlignment="Stretch"/
local:ResizeThumb Width="3" Cursor="SizeWE" Margin="-4 0 0 0"
VerticalAlignment="Stretch" HorizontalAlignment="Left"/
local:ResizeThumb Width="3" Cursor="SizeWE" Margin="0 0 -4 0"
VerticalAlignment="Stretch" HorizontalAlignment="Right"/
local:ResizeThumb Height="3" Cursor="SizeNS" Margin="0 0 0 -4"
VerticalAlignment="Bottom" HorizontalAlignment="Stretch"/
local:ResizeThumb Width="7" Height="7" Cursor="SizeNWSE" Margin="-6 -6 0 0"
VerticalAlignment="Top" HorizontalAlignment="Left"/
local:ResizeThumb Width="7" Height="7" Cursor="SizeNESW" Margin="0 -6 -6 0"
VerticalAlignment="Top" HorizontalAlignment="Right"/
local:ResizeThumb Width="7" Height="7" Cursor="SizeNESW" Margin="-6 0 0 -6"
VerticalAlignment="Bottom" HorizontalAlignment="Left"/
local:ResizeThumb Width="7" Height="7" Cursor="SizeNWSE" Margin="0 0 -6 -6"
VerticalAlignment="Bottom" HorizontalAlignment="Right"/
/Grid
/ControlTemplate
!-- Designer Item Template--
ControlTemplate x:Key="DesignerItemTemplate" TargetType="ContentControl"
Grid DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}"
local:MoveThumb Template="{StaticResource MoveThumbTemplate}" Cursor="SizeAll"/
Control Template="{StaticResource ResizeDecoratorTemplate}"/
ContentPresenter Content="{TemplateBinding ContentControl.Content}"/
/Grid
/ControlTemplate
/Window.Resources

....
Canvas x:Name="Container" Background="Transparent" **strong text**
ContentControl
Width="130" MinWidth="50" Height="130"
MinHeight="50" Canvas.Top="150" Canvas.Left="150"
Template="{StaticResource DesignerItemTemplate}"
Rectangle Fill="AliceBlue" Opacity="0.5" Margin="10" Stroke="Blue" StrokeThickness="1" RadiusX="0" /
/ContentControl
/Canvas
Window.Resources

!-- MoveThumb Template --
ControlTemplate x:Key="MoveThumbTemplate" TargetType="{x:Type local:MoveThumb}"
Rectangle Fill="Transparent"/
/ControlTemplate


!-- ResizeDecorator Template --
ControlTemplate x:Key="ResizeDecoratorTemplate" TargetType="{x:Type Control}"
Grid
local:ResizeThumb Height="3" Cursor="SizeNS" Margin="0 -4 0 0"
VerticalAlignment="Top" HorizontalAlignment="Stretch"/
local:ResizeThumb Width="3" Cursor="SizeWE" Margin="-4 0 0 0"
VerticalAlignment="Stretch" HorizontalAlignment="Left"/
Source of the question:
https://stackoverflow.com/questions/79014656

Question and source license information:
https://meta.stackexchange.com/help/licensing
https://stackoverflow.com/

Видео Add Rectangle to ContentControl C# wpf канала Emrah KAYA