Hi Lyudmil,

The Graphics object returned by CreateMeasureGraphics() is meant to help you only for some font and image measurements; calling its Draw methods won't reflect upon what's rendered in the browser. If all you need is some decoration lines, you could create locked link object in the diagram background instead of using the Graphics API. If you need some more complex graphics, handle the DrawBackground event as shown below.

protected void Page_Load(object sender, EventArgs e)
{
	if (!IsPostBack)
	{
		Diagram diagram = view.Diagram;

		DiagramLink decorationLine = diagram.Factory.CreateDiagramLink(
			new PointF(0, 0), new PointF(300, 300));
		decorationLine.HeadShape = ArrowHead.None;
		decorationLine.ZIndex = 0;
		decorationLine.Locked = true;
		decorationLine.Pen = new MindFusion.Drawing.Pen(Color.Blue, 10);

		diagram.DrawBackground += new DiagramEventHandler(diagram_DrawBackground);
	}
}

void diagram_DrawBackground(object sender, DiagramEventArgs e)
{
	IGraphics gdi = e.Graphics;
	System.Drawing.Pen pen = new System.Drawing.Pen(Color.Red, 10);
	gdi.DrawLine(pen, 300, 0, 0, 300);
}
 

I hope that helps,
Stoyan