If this shows links routed by default LinkRouter, you could assign smaller PreferredDistance value to the PatternRouter instance in routers chain:

var cr = diagram.LinkRouter as CompositeRouter;
if (cr != null)
{
	var pr = cr.Routers[0] as PatternRouter;
	if (pr != null)
		pr.PreferredDistance = 5;
} 

Or otherwise you could set larger ContainerNode.Margin value so it leaves more space around child nodes.

Alternatively, we have some handling of ContainerNodes in GridRouter, so you could replace the LinkRouter instance:

diagram.LinkRouter = new GridRouter(); 

but it does not create as nice routes in the general case. We plan to add ContainerNode handling to default PatternRouter in near future.

Regards,
Slavcho
Mindfusion