front end - What is the syntax for selecting multiple layers in an Overlay?

From the documentation:

Overlay[{Subscript[expr, 1],Subscript[expr, 2],...},{i,j,...},s] allows selections to be made and controls to be clicked in Subscript[expr, s].

and an example of selecting one layer:

Overlay[{Slider2D[], Graphics[{Opacity[.2], Disk[]}]}, All, 1]

Does anyone know what the syntax is for cases in which you want controls to be clicked in more than one layer, or all layers?

I have tried:

Overlay[{Slider2D[], Graphics[{Opacity[.2], Disk[]}]}, All, All]

and

Overlay[{Slider2D[], Graphics[{Opacity[.2], Disk[]}]}, All, {1,2}]

without success.

Answer

I don't think the third argument of Overlay can be used to do what you want. An alternative is to change the active layer dynamically using EventHandler as in

 DynamicModule[{layer = 1}, 
 EventHandler[
  Overlay[{Slider2D[], Graphics[{Opacity[.2], Disk[]}]}, All, 
  Dynamic[layer]], {{"MouseClicked",  2} :> ((layer = layer /. {1 -> 2, 2 -> 1}))}, 
 PassEventsDown -> True]]

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