Code

diagramView.Behavior = Behavior.DrawLinks;
diagramView.AutoScroll = true; 

Code

class MyDiagramView : DiagramView
{
	protected override void OnMouseDown(System.Windows.Forms.MouseEventArgs e)
	{
		base.OnMouseDown(e);

		if (e.Button == MouseButtons.Right)
		{
			prevPanPoint = ClientToDoc(e.Location);
			panning = true;
		}
	}

	protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs e)
	{
		base.OnMouseMove(e);

		if (panning)
		{
			var currentPoint = ClientToDoc(e.Location);
			ScrollX += prevPanPoint.X - currentPoint.X;
			ScrollY += prevPanPoint.Y - currentPoint.Y;
			RecreateCacheImage();

			prevPanPoint = ClientToDoc(e.Location);
		}
	}

	protected override void OnMouseUp(System.Windows.Forms.MouseEventArgs e)
	{
		if (e.Button == MouseButtons.Right)
			panning = false;
		else
			base.OnMouseUp(e);
	}

	PointF prevPanPoint;
	bool panning;
}