[Users] Layertreebuilder has issues when layer removed.

[Phil Scadden]

> You’re right. I wasn’t paying much attention to the actual removal 
> logic there. I was mostly trying to demonstrate the use of cascade 
> and/or eachChild. I used something like that in a project were there 
> were all leaf nodes were always part of a group node.
Just to clarify here. This is in your main code, not in added to Geoext 
somewhere. So when you remove a layer in your main code (I go 
mapPanel.map.layers[i].destroy() to remove), you are locating the 
associated node in the layertree and then executing your code?

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