Strange Memory issue

Titanium SDK: 3.2.3 GA

iOS: 7.1

While trying the following sample code on iOS (I used iPad3) I noticed that the created views are never garbage collected. (the code is pretty simple, clicking the button creates 200 views and adds them to the window).

For profiling the memory I used the Instruments tool from XCode. Each time the button is pressed new bunch of views are created but the old ones are never returned.

Here is the code:

MyView.js

exports.MyView = function() {
 
    var view = Ti.UI.createView({
        top : 0,
        left : 0,
        width : 1000,
        height : 500,
        backgroundColor : 'white'
    });
 
    view.myFunc = function() {
        for (var i = 0; i < 10; i++) {
            Ti.API.info("Counting: " + i);
        }
    };
 
    /**
     * Creates 200 views and adds them to the view object above
     */
    function createManyViews(view) {
 
        var colors = ['blue', 'yellow', 'green', 'pink', 'orange', 'red'];
 
        var top = 0;
        for (var i = 0; i < 10; i++) {
            var left = 0;
            for (var j = 0; j < 20; j++) {
                var v = Ti.UI.createView({
                    top : top,
                    left : left,
                    width : 50,
                    height : 50,
                    backgroundColor : colors[(i + j) % 5],
                });
                view.add(v);
                left = left + 50;
            }
            top = top + 50;
        }
    };
 
    createManyViews(view);
 
    return view;
};

(function() {
    var MyView = require("MyDir/MyView").MyView;
    var myView = null;
    var win = Ti.UI.createWindow();
    var btn = Ti.UI.createButton({
        bottom : 10,
        width : 150,
        title : "Create views" 
    });
    btn.addEventListener('click', function() {
        if (myView) {
            win.remove(myView);
        }
 
        myView = new MyView();
        win.add(myView);
    });
    win.add(btn);
    win.open();
})();

1. Remove the definition of view.myFunc()
2. Move the code from createManyViews() out of the function (remove the function)

However, I would like to know what is the actual cause for this so I can avoid similar problems.