What we do is to overwirte ChangeVisibility function of map legend.
like
var
OrgChangeVisibility = legend.ChangeVisibility;
legend.ChangeVisibility = MyChangeVisibility;
function MyChangeVisibility(objectId)
{
//from legend tree object and objectId find node which has layer or
group name informaton
//call original changeVisibilty
OrgChangeVisibility(objectId);
}
Nick
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