webtextField not filled

I tried to implement a datepicker, wrapping third party framework, tying him to a WebTextField (by controlID as normal).
When I run the web application and I click on the WebTextField, the picker is displayed correctly, but then when I choose the date the WebTextField is not automatically filled (as normally gets in the demo).
Why ? Please can anyone help me?

Thanks

Luciano Monti

Any idea ?

You may want to make your code available…