An alternative to the label attribute on the tab-content element. This allows other elements to be specified as part of the label, like an anchor element.
None
Any
<tab-content id="assigned_tab" formsOnShow="redirectForm();">
<tab-label><a href="SubscriptionMembers.do?subscriptionId=<%=request.getParameter("subscriptionId")%>">Assign</a></tab-label>
</tab-content>