private void DragSourceContainer_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
mouseDownCoordinates = Coordinates(e);
if (DragManager.DragCandidate == null)
{
DragManager.DragCandidate = DragSource.GetElementToDrag(mouseDownCoordinates);
if (DragManager.DragCandidate != null)
{
DragManager.DragCandidateSponsor = DragSource;
}
}
}
