why my save file open empty ? is this because I do not buy the licence?

It is too tricky to define classes using only mouse. If I can generate class with plain text style.

Enable 8-digit HTML color codes such as #FFFFFF00 so that elements such as classes and shapes can be transparent. Currently, if more than 6 digits are typed, the app just truncates the value.

I find window position behavior very unintuitive in MacOs. I work around around it by repeatedly resizing and clicking locations at top of the frame until the window moves.

I can't create well-formed notes for nodes description because all text in the note fill one single line without lines breaking.
It will be fine to provide any hot keys for this purpose to style text.

add clear open recent

I know that the Robustness Diagram is not part of the UML. However StarUML already has the required components, less the diagram. Inclusion of a Robustness Diagram, along with the following capabilities would complete the feature. These features are as follows, 1. the ability to associate especially boundary and entity objects with classes, 2. the ability create these diagrams as a sub diagram of a use case.

I am working on a robustness diagram I would like the text form the use case displayed on the diagram so that if i make changes the documentation is synchronized with it. Hence if i could place a note component and the diagram and link it to the use case so that it shows the documentation. Also if i make changes in the note component the Documentation of the Use Case gets updated as well.

Allowing to change seq to OPT in the selected Combined Fragment

When I'm writing sequence diagrams, the editor adds a frame into the view automatically. However, I always end up deleting this frame since it prevents me from performing box selections of the sub-elements.

Dragging in the body of a frame should not cause the frame to start dragging, but instead should initiate a box selection.

If I click on "not navigable" the navigability arrow appears, and vice versa.

I'd like to design a new diagram starting from an existing one, without changing it. It should be possible to clone or "duplicate" a diagram

Add Collaboration Diagram from Sequence Diagram

There could be an easier way to move around the diagram, for example when pressing a key the   The mouse would become a "hand" that would he

The interface looses its color when a relation is added or it can not add a color to interface when some relation exist.

It would be great if there was an extension for Dart as well.