How to Get Nested Comps into new array from current active comp??

Thanks. Can you please share a function() or idea ..to get all nested Comps into a single array from current active comp.??

Am banging my head on wall to find atleast one property where its linked to Nested comp and Main comp in Project window.I saw "Reveal in Composition" is Linked to Parent Comp but no property in extended script guide. 

AFX COMP

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MainComp(Precomp(Precomp(Precomp(Precomp)))) 

Script

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var myComp=app.project.activeItem;

var myLayers=myComp.layers;

var allComps= new Array(); 

for(i=1;i<myComp.numLayers;i++){

curLayer=myLayers[i];   

if(curLayer.source instanceof CompItem==true){ 

allComps = function getAllNestedComps(??); 

}