Criei um @ móvUserControl

    <UserControl x:Class="Restaurant.Views.Managerer.TablePanel"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Restaurant.Helpers.Converter"
        mc:Ignorable="d"
        x:Name="root"
        MouseLeftButtonDown="root_MouseLeftButtonDown"
        MouseLeftButtonUp="root_MouseLeftButtonUp"
        MouseMove="root_MouseMove"    
        DataContext="{Binding RelativeSource={RelativeSource Self}}">
....

Códig

Point anchorPoint;
        Point currentPoint;
        bool isInDrag = false;

        private void root_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            var element = sender as FrameworkElement;
            anchorPoint = e.GetPosition(null);
            element.CaptureMouse();
            isInDrag = true;
            e.Handled = true;
        }

        private void root_MouseMove(object sender, MouseEventArgs e)
        {
            if (isInDrag)
            {
                var element = sender as FrameworkElement;
                currentPoint = e.GetPosition(null);

                var transform = new TranslateTransform
                                    {
                                        X = (currentPoint.X - anchorPoint.X),
                                        Y = (currentPoint.Y - anchorPoint.Y)
                                    };
                this.RenderTransform = transform;
                anchorPoint = currentPoint;
            }
        }

        private void root_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (isInDrag)
            {
                var element = sender as FrameworkElement;
                element.ReleaseMouseCapture();
                isInDrag = false;
                e.Handled = true;
            }
        }

Se eu mudar o código de

X = (currentPoint.X - anchorPoint.X),
Y = (currentPoint.Y - anchorPoint.Y)

par

X = (currentPoint.X),
Y = (currentPoint.Y)

Posso mover oUserControl, mas o mouse eUserControl não combin