Here is a sample from my model.

I have two Rules

[RuleOn(typeof(Connector), FireTime = TimeToFire.TopLevelCommit)]
public sealed class MyAddRule : AddRule
{
public override void ElementAdded(ElementAddedEventArgs e)
{
if (e == null) throw new ArgumentNullException("e");
}
}

[RuleOn(typeof(ElementShape), FireTime = TimeToFire.TopLevelCommit)]
public sealed class ElementShapeAddRule : AddRule
{
public override void ElementAdded(ElementAddedEventArgs e)
{
if (e == null) throw new ArgumentNullException("e");
}
}

And here is a way how to add them to a model

public partial class SwitchboardDomainModel
{
protected override Type[] GetCustomDomainModelTypes()
{
return new System.Type[] { typeof(MyAddRule), typeof(ElementShapeAddRule) };
}
}

Ivana