In Modelio diagrams, there are three different ways of drawing links:
All Modelio diagrams include the model expert feature, which provides real-time assistance when you are creating links in diagrams. If you try to create an authorized element (in this example, an association between 2 classes), the model expert highlight the concerned element in green, indicating that the creation operation you are attempting is allowed. If you try to create an unauthorized link (for example, an association between a package and a class), the model expert highlight the concerned element in red, indicating that the creation operation you are attempting is not allowed.
Note: If you want to draw a link in bendpoint mode, simply hold down the “Shift” key on your keyboard while you are drawing the link.