Anyone knows about web micro(used to write gui code commonly k/a wm)

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wm is basically used for GUI code. Anyone know hows web micro works or have any link to its tutorial as i am not getting much information in google even.

I am facing one issue: I am selecting any adapter then with out saving If I am selecting the previous one back I m getting exception.

Below is the piece of code *.wm

#if($selectedAdapter != $serviceNodeProfile.Adapter) {
#set $removedProfile = $serviceNodeProfile.remove()
#if(!$saveObjectMap.removedProfile){
#set $ignore = $saveObjectMap.put("removedProfile",$serviceNodeProfile.remove())
}

What I have tried:

Anyone knows about webmicro(wm) please let me know? It is used to write GUI code commonlyhave an extension as *.wm