private void Samplebutton_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
if (_buttonPosition == null)
{
_buttonPosition = ((UserControl)sender).TransformToAncestor(MyGrid).Transform(new Point(0, 0));
}
var mousePosition = Mouse.GetPosition(MyGrid);
deltaX = mousePosition.X - _buttonPosition.Value.X;
deltaY = mousePosition.Y - _buttonPosition.Value.Y;
MyBorder.BorderBrush = new SolidColorBrush(Color.FromRgb(81, 81, 81));
_isMoving = true;
Grid.SetZIndex(this, index++);
Panel.SetZIndex(this, 666);
UniformGrid.SetZIndex(this, index++);
}