x-editable on shown event dropdown (<select />) source refresh

I'm trying to change a x-editable source data just before it is shown so that my dropdown menu entries are always fresh even if source changes.

Here is a link to explain: http://jsfiddle.net/XN7np/3/

// my source that can change over time
var source = [{'value': 1, 'text': 'fine'}, {'value': 2, 'text': 'bad'}];

$('#my_select').editable({
    'mode'  : 'inline',
    'source': source,
});

$('#my_select').on('shown', function(ev, editable) {
    // now changing my source just before dropdown is shown
    source = [{'value': 1, 'text': 'GOOD'}, {'value': 2, 'text': 'FU'}];

    //$(editable).editable('option', 'source', source); NOT WORKING
    //$('#my_select').editable('option', 'source', source); NOT WORKING
    //$(this).editable('option', 'source', source); NOT WORKING
});

any idea?