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I don't see the problem with this approach to be honest. Even if the VI you are calling is not DD (Implemented as static in the Parent) the VI being actually invoked will be the correct child version. Your problem is knowing which version on the hierarchy chain to call explicitly. If you already have a function to return unique identifiers for the different UIs, make that an input of your static VI and pass it to the DD VI which subseqeuntly makes an ID check at each level of the hierarchy and then launches the UI if the ID matches and passes the control to the "Call parent method" node if it doesn't match. Think of it as a "Chain of responsibility" which is a valid OO approach. This way you can filter down from the actual child until you have the correct UI.