Features of August release.
1. Adding elements on the diagram by double-click on fields of classes which have additional information in mapping files.
2. Hiding elements (see 1.) by second double-click on fields.
3. Autolayouting elements at first start of diagram and adding elements.
4. Saving positions and states (visible/hidden) of diagram elements.

Future:
5. Displaying diagram as eclipse view.
6. Navigation. When we select some element on diagram, related element in mapping file should be highlighted.