One of the most common mistakes for first-time Seaside developers is to send the message
call: a component from another component’s rendering method,
renderContentOn:. The rendering method’s purpose is rendering. Its only job is to display the current state of the component. Callbacks are responsible for changing state, calling other components, etc. If you want to render one component inside another one read Chapter 12.
call: a component from
renderContentOn:, only call components from callbacks or from