wpf usercontrol resizing with thumb not firing DragDelta - wpf

Question

I have created a Usercontrol that I would like to make resizable using the thumb control. I have added my control to a Canvas and when I click on the thumb control the only events that are fired are Dragend and DragStart (in that order) and DragDelta is not even firing. I have found someone with a similar problem Thumb inside an ItemsControl not firing DragDelta event but there is no way I can ask them if they found a solution.
This is the code :
<UserControl x:Class="test.ucChair"
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"
d:DesignHeight="53" d:DesignWidth="93" RenderTransformOrigin="0.5,0.5" Background="Beige"
>
<Grid Name="grd" Margin="0,0,0,0">
<Rectangle x:Name="rectAngle" Margin="0,0,0,0" Stroke="Black" RenderTransformOrigin="0.5,0.5" Grid.ZIndex="1000" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" MinHeight="53" /> <!-- Width="93" Height="53"-->
<TextBox x:Name="txtName" Text="OPEN" Margin="0,0,0,0" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" IsReadOnly="True" IsReadOnlyCaretVisible="False" TextWrapping="Wrap" Width="93" KeyDown="txtName_KeyDown" FlowDirection="RightToLeft" BorderThickness="0" FontSize="14" Cursor="Hand" TextAlignment="Center"/>
<Thumb Name="thmbResize" DockPanel.Dock="Right" VerticalAlignment="Bottom" Height="15" Width="15"
DragDelta="OnResizeThumbDragDelta"
DragStarted="OnResizeThumbDragStarted"
DragCompleted="OnResizeThumbDragCompleted" HorizontalAlignment="Right">
</Thumb>
</Grid>
</UserControl>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace test
{
/// <summary>
/// Interaction logic for ucChairLeft.xaml
/// </summary>
public partial class ucChair : UserControl
{
public ChairType AngleType;
//?? public int SectionID;
public ucChair()//ChairType CType)//?, int _SectionID)
{
InitializeComponent();
}
private void OnResizeThumbDragCompleted(object sender, System.Windows.Controls.Primitives.DragCompletedEventArgs e)
{
System.Diagnostics.Debug.WriteLine("DragEnd");
Mouse.Capture(null);
}
private void OnResizeThumbDragDelta(object sender, System.Windows.Controls.Primitives.DragDeltaEventArgs e)
{
System.Diagnostics.Debug.WriteLine("DragDelta");
}
private void OnResizeThumbDragStarted(object sender, System.Windows.Controls.Primitives.DragStartedEventArgs e)
{
Mouse.Capture(this);
System.Diagnostics.Debug.WriteLine("DragStart");
}
}
}
<Window xmlns:test="clr-namespace:test" x:Class="test.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="300" Width="300">
<Canvas Width="300" Height="300" Background="LightBlue">
<test:ucChair Canvas.Left="50" Canvas.Top="100" Width="50" Height="50" Background="Yellow"/>
</Canvas>
</Window>
Any help greatly appreciated!