setDefaultButton not working

Hi

Can anybody suggest me how to set default button in jspDyn page , so that on pressing enter button it should be submitted. I have used the below code but it is not responding to the Enter key.

<hbj:button

id="Search"

text="SearchOrder"

width="150px"

tooltip="Click here to search Orders"

onClick="SearchOrder"

disabled="false"

design="STANDARD">

<%

myFormId.setDefaultButton(Search);

%>

</hbj:button>

Regards,

Joseph