Redesign Add Association dialog to be simpler, there will be 2 modes of defining new association:
- simple mode
- where user can define simple property association which creates only one property on one target persistent type
- in this mode is also possible to define 'ItSelf' association (for example persitent type 'User' has property 'Parent' of type 'User'
- advanced mode
- where user can define advanced, navigation properties on both sides (source-target) of persistent types