This method iterates through the IGoLabeledParts of this view's document, starting with the current primary selection (if it is an IGoLabeledPart), looking for the next part that satisfies the MatchesNodeLabel predicate. If it finds such an object, it makes it this view's only selected object. This method is called by GoToolManager when the user types a letter or digit, if the value of DisableKeys does not have the GoViewDisableKeys.SelectsByFirstChar flag set. (This method does not check for that flag.) This method does nothing if CanSelectObjects is false.