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It is important to remove the listeners when your component's scope is destroyed. For example if due to a tabpanel switch of tabs your form is hidden, the component and it's angular scope will be destroyed - at which point you have to remove any listeners that you added on model properties (like the foundset property), because the model properties will be reused in the future (for that form when it is shown again) and will keep any listeners in it. When that form will be shown again, it's UI will get recreated - which means your (new) component will probably add the listener again.

If you fail to remve remove listeners on $scope destroy this will lead to memory leaks (model properties will keep listeners of obsolete components each time that component's form is hidden, which in turn will prevent those scopes and other objects that they can reference from being garbage collected) and probably weird exceptions (obsolete listeners executing on destroyed scopes of destroyed components).

Example of unregistering removing a listener:

			$scope.$on("$destroy", function() {
				if (foundsetListener && $scope.model.myFoundset) $scope.model.myFoundset.removeChangeListener(foundsetListener);
			});