Textfield keyboard toolbar buttons stop responding once the textfield loses focus and is re-focused but only when including a module

Question

We have added an iOS module which contains a library (.a) to a simple keyboard and textfield titanium project.

The library uses quite a lot of javascript via UIWebView and it communicates back to the application via frames.

The library is very stable and reliable when using it inside an iOS project but is causing issues when integrated with a titanium module.

Here is a simple version of the problem code

var module = require ('com.module.test');

var win1 = Titanium.UI.createWindow({  
    backgroundColor:'#fff'
});

var cancelKb = Titanium.UI.createButton({
    title : "Cancel",
    style : Ti.UI.iPhone.SystemButtonStyle.BORDERED
});
cancelKb.addEventListener('click',function(e){tf.backgroundColor='#faa'; tf.blur(); });

var doneKb = Titanium.UI.createButton({
    title : "Done",
    style : Ti.UI.iPhone.SystemButtonStyle.DONE
});
doneKb.addEventListener('click',function(e){tf.backgroundColor='#aaf'; tf.blur(); });

var tf = Ti.UI.createTextField({
    hintText : "Enter code",
    top : 30,
    height : 44,
    left : 5,
    right : 5,
    paddingLeft : 20,
    clearButtonMode : Ti.UI.INPUT_BUTTONMODE_ALWAYS,
    autocorrect : false,
    visible : true,
    zIndex : 99,
    returnKeyType : Ti.UI.RETURNKEY_DONE,
    keyboardType : Ti.UI.KEYBOARD_PHONE_PAD //UI.KEYBOARD_NUMBERS_PUNCTUATION,
});
var flexspace = Titanium.UI.createButton({
    systemButton : Titanium.UI.iPhone.SystemButton.FLEXIBLE_SPACE
});

tf.keyboardToolbar = [cancelKb, flexspace, doneKb];
win1.add(tf);
win1.open();
tf.focus();

If the following var module = require ('com.module.test'); isn't included the keyboard toolbar buttons work fine multiple times.

Including this module will work until the keyboard is dismissed the first time, and then the "Cancel" and "Done" buttons will no longer respond when the keyboard becomes refocused.