Let's assume the following scenario: in a kanban view with a
domain, remove that domain and quickly click on a record to open it
in form view. On a slow network, it may happen that the reload of
the kanban view (triggered by the domain change) returns after the
load of the form view.

Before this rev., when this happened, the form view was correctly
displayed but the control panel contained the buttons, searchview,
pager... of the kanban view.

Note that this fix is quite ugly, but it won't be necessary anymore
as soon as the control panel won't be shared between actions and
controllers, i.e. as soon as each controller will have its own
control panel.