ArgoUML's Editing Pane is the main work area. You use this pane to edit diagrams. To this end, it contains a toolbar at the top, which contains all items (ModelElement) that can be drawn on the current type of diagram. Clicking on a tool-icon in the toolbar selects the type of ModelElement that will be placed by a simple click in the diagram area. The toolbar also contains some general drawing tools, for diagram decoration with lines, text, and shapes, which are not part of the UML model.