[Connect U17 c# WPF] Problems with DockableToolbar

I am trying to recreate the example from examples\WPFDemo\ however, I am having a couple of issues.

1) When the toolbox is closed, it is throwing an exception ('System.ComponentModel.Win32Exception' in WindowsBase.dll)..The exception seems to be handled , though it is displayed in my visual studio's immediate window.  While the exception is not causing a hard error, it is causing the toolbox to run poorly in debug mode and I doubt that is an expected behavior. Every time the toolbox is reopened and closed, the exception is compounded further..

Additionally, after the first exception appears, it seems to infect every toolbox and it will appear anytime another toolbox is brought into focus.

2) The drag symbol on the left side of the toolbar that appears when a toolbox is docked is not showing.. It seems the usercontrol is sitting ontop of it regardless of any margins or alignment applied.

Any thoughts on these issues would be appreciated.

Thanks!

public class MsToolbox : DockableToolbar, IGuiDockable
    {
        public MsToolbox(UserControl toolboxUserControl)
        {
            Content = toolboxUserControl;
            Title = "Test";

            AttachingToHost += OnAttachingToHost;
            DetachingFromHost += OnDetachingFromHost;
            Attach(TopoCloudClient.Addin, "Testing");
            
        }

        private void OnDetachingFromHost(object sender, EventArgs e)
        {
            Debug.Print("Detaching");

        }

        private void OnAttachingToHost(object sender, AttachingToHostEventArgs e)
        {
            e.AttachPoint = new Point(0, 0);
            Debug.Print("Attaching");
        }

        protected override void OnClosed(EventArgs e)
        {
            base.OnClosed(e);
            Detach();
            Dispose();
        }


        #region IGuiDockable Members

        private Size _rejectedSize = Size.Empty;

        public bool GetDockedExtent (GuiDockPosition dockPosition, ref GuiDockExtent extentFlag, ref Size dockExtent)
        {
            
            dockExtent.Height = CommonDockSize.Height;
            
            if (dockPosition == GuiDockPosition.Top ||
                dockPosition == GuiDockPosition.Bottom)
            {
                dockExtent.Width = (int) ActualWidth + 25;
                extentFlag = GuiDockExtent.Specified;
            }
            else if (dockPosition == GuiDockPosition.NotDocked)
                extentFlag = GuiDockExtent.Specified;
            else
                extentFlag = GuiDockExtent.InvalidRegion;
            return true;
        }

        public bool WindowMoving (WindowMovingCorner corners, ref Size newSize)
        {
            newSize.Height = CommonDockSize.Height;

            if (corners != WindowMovingCorner.LowerRight || _rejectedSize.Equals (newSize))
            {
                _rejectedSize = newSize;
                newSize.Width = (int) ActualWidth;
            }

            return true;
        }

        #endregion
    }

<UserControl x:Class="TopoCloud_Client.Windows.TopoDOT.Toolboxes.Point_Cloud_Snap_Mode.PointCloudSnapModeWindow"
                      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                      xmlns:userControls="clr-namespace:TopoCloud_Client.Common.User_Controls"
					  xmlns:viewModels="clr-namespace:TopoCloud_Client.Windows.TopoDOT.Toolboxes.Point_Cloud_Snap_Mode.View_Models"
                      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
                      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
                      mc:Ignorable="d" 
                      d:DesignHeight="24">
					  
	<UserControl.DataContext>
        <viewModels:PointCloudSnapModeViewModel/>
    </UserControl.DataContext>
					  
    <StackPanel Orientation="Horizontal"  >
        <CheckBox Margin="0,0,12,0" VerticalAlignment="Center">CheckBox in Toolbar</CheckBox>
        <Button VerticalAlignment="Center" MinHeight="24" Padding="3">Button in Toolbar</Button>
    </StackPanel>
</UserControl>

        public static void OpenToolbox(this UserControl userControl)
        {
            var toolBox = new MsToolbox(userControl);
            toolBox.Show();
        }

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