improvement dialogbox and bugfix contact without user 

changed use of dialogbox to callbacks, put variables in object, bugfix when contact without user gets loaded

- [x] finish the code
- [ ] gather feedback for my changes


| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tests pass?   | none
| Fixed tickets | #11 
| Doc           | none