jQuery UI Datepicker uuid bug?

I'm extending the datepicker in my code by resetting the _generateHTML function in beforeShow, i.e. $.datepicker._generateHTML = function(a) { .. } This way I can do whatever I want to the buttons on the buttonpanel. Here's my example code: http://jsfiddle.net/benno_007/UjFEm/1/. Sometimes the datepicker will work (i.e. click a date), sometimes it won't. This is because it takes > 1ms for my