I am encountering an issue with treepanel on air
My code is working as expected in a web browser, however in air this doesn't work
I have this error :

[app:/application.html#]Error: Adobe AIR runtime security violation for JavaScript code in the application security sandbox (eval)

When looking at the line specified (4233), I found this :

        doDecode = function(json){
            return eval("(" + json + ")");    
Is it normal ? If yes is there a way to correct that ?

I thought extjs was free of eval() but I've found some in ext-all-debug (using version 3.3.1)