public override void Accept(IExecutableObject obj)
{
var alt = obj as AlternativeUnit;
// Assert that obj == null || !InAlternate
if (alt != null)
{
InAlternateState = true;
Alternate = alt;
}
else
{
if (InAlternateState)
{
Alternate.Accept(obj);
}
else
{
base.Accept(obj);
}
}
}
