I'm using Titanium Mobile 1.3.0 and Android SDK.
I want to use the "watch" method. Whenever a value is assigned to it, it should calls up a function. But I get the Error "Cannot find function watch in object".

Example:

function abc() {
    this.start = 4;
    this.watch('start', function (prop, oldval, newval) {
        ...
    });

    this.start = 5;
}

Is there something similar? Except "addEventListener"?