public void DragSourcePreviewMouseMove(Point position)
{
if (_userInterfaceService.IsBusy())
{
return;
}
if (!_isDragging && (Math.Abs(position.X - _startDragPoint.X) > SystemParameters.MinimumHorizontalDragDistance ||
Math.Abs(position.Y - _startDragPoint.Y) > SystemParameters.MinimumVerticalDragDistance))
{
StartDrag();
}
}