Hi Kalle, I am not sure what is the reason, but I opened an issue after this change: https://issues.apache.org/jira/browse/TAP5-2482 , because my tapestry testify tests started to fail due to this. Regards, Balazs On 27 August 2015 at 22:19, Kalle Korhonen wrote: > In 22bd2c14b3c7d91ebd97cbc264882552c12044f7 (since 5.4-beta-31), Howard had > changed the form control name to be based on component's simple id instead > of the component's client-side id. This change is not based on any open > issue, so I'm just trying to find the reason for the change? > > Kalle >