Block a user
Undo-Stack working with model data (with "do you want to save your changes?" dialog)
When editing model data the current data should be shown in the editor
CRUD for model data (without undo stack)
Add "Edit item" dialog to change multiple values (using ItemDetailMapper)
When editing model data the current data should be shown in the editor
CRUD for model data (without undo stack)
Undo-Stack working with model data (with "do you want to save your changes?" dialog)
Save/load model data in JSON file (with "do you want to save your changes?" dialog)