This class must be inherited by the steps
| Function | __init__ | Undocumented |
| Function | next_step | Undocumented |
| Function | post_init | A virtual method that must be defined on child when it's |
| Function | has_next_step | Undocumented |
| Function | has_previous_step | Undocumented |
| Function | previous_step | Undocumented |
| Function | validate_step | A hook called always when changing steps. If it returns False |
A virtual method that must be defined on child when it's necessary. This method will be called right after the change_step method on PluggableWizard is concluded for the current step.
A hook called always when changing steps. If it returns False we can not go forward.