You can move the cluster around - which can be a solution if the cluster can be left in full size, but only a section of it should be seen...but that's seldom the case.
Or you can move the contents of the cluster around, effectively creating a scroll effect...but that would be just as messy as hiding/showing the controls.
But why put a tab control inside a cluster when you can put cluster(s) on a tab control...?
If having more than one cluster adds to many wires just bundle them together / bundle the final cluster in the background.