public void ZoomTowards(float newCellSize, Point location)
{
Coordinate oldCoordinate = ToWorldCoordinate(location);
CellSize = newCellSize;
Coordinate newCoordinate = ToWorldCoordinate(location);
TopLeft = TopLeft.Offset(
oldCoordinate.X - newCoordinate.X,
oldCoordinate.Y - newCoordinate.Y);
}