[Users] Layer tree with dependencies between layers

[Alain Camus]

Hello GeoExt list, 

I'd like to make a custom layer tree with these requirements : 
* layer A0 is the parent of layer A1 
* if layer A1 is checked, layer A0 is also activated 
* if layer A1 is unchecked, nothing happens to A0 
* if layer A0 is checked, nothing happens to A1 
* if layer A0 is unchecked, layer A1 is also deactivated. 
* same behaviour for other pairs of layers {B0, B1}, {C0, C1}, ... 
In other words, the layer X1 is only visible if the layer X0 is also visible 

I thought I saw something like this in the mapfish examples but I can't access them anymore ("not found" when clicking the links in http://dev.mapfish.org/sandbox/website/.build/html/examples.html). 

Does this behaviour already exist in GeoExt maybe ? 

Have a nice day, 

Alain 
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