Hi,

SwimlaneLayout will arrange nodes automatically along the LaneGrid lanes or your custom lanes. If nodes will be drawn by the user, you don't have to use the layout class.

You must implement the ISwimLaneGrid interface only if you need to use a custom grid and need to apply the SwimlaneLayout algorithm. You can create a custom grid by either composing it from locked background nodes, or by placing a grid control behind the diagram and setting the diagram's background to Transparent.

You can add a new row to the built-in grid like this:

private void OnAddRow(object sender, RoutedEventArgs e)
{
	diagram.LaneGrid.RowHeaders.Add(
		new Header("row " + diagram.LaneGrid.RowHeaders.Count));
} 

I hope that helps,
Stoyan