If a new diagram is shown in a new modeling window the corresponding toolbox will appear in the toolbox area.
The toolbox provides all available stencils to perform diagramming of the chosen diagram type.
You may now drag symbols from the toolbox onto the work area. If a wrong symbol has been dragged it can either be dropped back on the toolbox or be deleted by pressing Esc on the keyboard.
If you drag a new item from the toolbox over the diagram and the diagram contains a selected item IYOPRO will automatically create a sequence flow (or whatever makes sense) between the selected item and the new one.
If you select an item in the diagram or move the mouse over an element a context sensitive tool-bar will appear. This tool-bar provides commonly used elements in context of the reference object, from which you may drag additional items onto the diagram.