Attaching function as property to view object works on iPhone, NOT on Android

I need to store a callback function in views and other objects so that I can fire async HTTPClient operations that can later call it to refresh images and texts.

I did something similar to the following, and it works perfectly on iPhone.

var myfun = function(param) {
    Ti.API.info('Myfun called by ' + param);
};
 
var x = {fun:myfun};
x.fun('x');     // this always works 
 
var view = Ti.UI.createView({});
view.fun = myfun;
view.fun('view'); // this crashes on Android

Unfortunately Android crashes on last line with message "TypeError: Cannot call property fun in object ti.modules.titanium.ui.ViewProxy@4380b2c8. It is not a function, it is 'object'."

Any idea on how to convince Android that 'fun' is a function indeed?

Thanks