hi,
i have a a4j:commandButton like following

 <a4j:commandButton
 style="font-family:Verdana;font-size:11px;width: 160px;"
 action="#{identity.login}"
 value="#{messages.loginForm_loginButton}" reRender="form,mp"

 />

now ,what i want is to put a accessKey attribute so that user can simply press 'return' to submit the form. But i failed by using

 <a4j:commandButton
 style="font-family:Verdana;font-size:11px;width: 160px;"
 action="#{identity.login}"
 value="#{messages.loginForm_loginButton}" reRender="form,mp"
 accessKey="&#13;"
 />

Anyone can help me?

thanks