If you mean that you need to add an additional action to the Logon Form using the Action attribute, you can do this. Create custom logon parameters as described in the How to: Use Custom Logon Parameters and Authentication article and add a method with the Action attribute applied in it. The default action container for such actions is RecordEdit. But, the Logon Form uses the PopupActions action container. So, move your action to the PopupActions action container in the Model Editor as described in the Place an Action in a Different Location article. Then, the ObjectMethodActionsViewController creates actions implemented using the Action attribute. The Logon Form does not create additional controllers by default. It's necessary to create an ObjectMethodActionsViewController instance manually as described in the Logon Form Controllers and Actions article.