Alloy createController is not released from memory - appcelerator

Question

Recently I have been doing some memory analysis on one of my application. The application is made for Android platform. For two of the screens, I am observing that there is a leak.
No validate, I removed all of my code and kept only $.screenName.open() call on both the controllers and they way of calling them is:
Alloy.createController(screenToLaunch, payloadJson);
Inside the respective controllers, the open() call was present. I use DDMS and do a heap analysis.
Before opening Controller A, I pressed the cause GC several time to get a stable allocated reading. Once done I launch Controller A and press the back button to close it. Now when I click on cause GC several times, there is a difference of 60KB, everytime.
I am not storing the createController reference in any global variable. Any idea as to why it is behaving in such manner?
Updated:
Above is the HPROF difference between opening and closing of the controller. I am not using any DB calls, yet I see there are many DB related calls being made. I think it might be that the framework is using those calls for its internal functioning.

Answer 1

I'm using this architecture for controllers (UI.Windows) and works very well.
Open window : Alloy.createController('name_controller').getView().open();
Cleaning up Alloy controllers

Answer 2

This is my cleanup method for all controllers and widgets:
someview.js
var args = arguments[0] || {},
data = {};
data.button = Alloy.createController('button',{
title:'button'
}).getView();
$.view.cleanup = function() {
$.destroy();
$.off();
data.button.cleanup();
$ = data = args = null;
};
button.js
var args = arguments[0] || {},
data = {};
data.click = function() { ... };
$.view.addEventListener('click',data.click);
$.view.cleanup = function() {
$.destroy();
$.off();
$.view.removeEventListener('click',data.click);
$ = data = args = null;
};
I've created a global function, to call the cleanup method and remove it's content on every children of the controllers:
UPDATE
added delete operator and try statement
exports.unset = function(view) {
if(view) {
if(view.children && view.children.length) {
for(var i in view.children) try { util.unset(view.children[i]);
} catch(e) {}
view.removeAllChildren();
}
if(view.views && view.views.length) for(var i = view.views.length; i > 0; i--) if(view.views[i-1]) {
if(view.removeView) view.removeView(i-1);
try { util.unset(view.views[i-1]);
} catch(e) {}
}
if(view.cleanup) try { view.cleanup();
} catch(e) {}
view = null;
delete view;
}
};