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Property of element in cluster that is located in a cluster

How can I get access to control properties of elements in  Cluster II which is located in Cluster I?
It is no problem to get references to elements in cluster I which is part of an application VI. Thus you can get the reference on cluster II.
But till now I didn't succeed in getting access to the elements located in cluster II.

The example files contain the two cluster typedefs and a test VI which indicates the problem.
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Place a "To More Specific Class" after Index Array, create a constant for "target class" and select GObject>>Control>>Cluster>>Cluster. Now the wire will know that it points at a cluster and give you access to the cluster properties.

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