Click on wire components and the PacoWire tool will appear. It should look like the following screenshot. If the icons are not loaded you'll need to re-run the setup (see installation guide).

Below the application menu and toolbar, there are two toolbars organized into different categories. The top toolbar represents the set of components the tool knows about. The bottom toolbar represents the set of composition patterns and composition adapters. Composition adapters are located in the adapters category, the other categories contain normal composition patterns. The big white space is the editing canvas, where the actual visual component building occurs.

To place a component on the canvas, you have to click on the component in the components toolbar. Then point to a desired location in the editing canvas and press the left mouse button. Notice that when you have selected a component in the components toolbar the cursor changes in a cross when you hover over the canvas. Now, place the JButton component of the GUI category onto the canvas. If you accidently added wrong components, you can delete them by pressing on the right mouse button on that component in the canvas. If you placed the JButton on the canvas correctly you'll see a rectangle representing that component on the canvas. Double-clicking on a  component in the canvas shows their documentation.

A composition pattern is placed on the canvas in the same way as a component. Place the ToggleControl composition pattern of the Misc category on the canvas. You'll see two rectangles connected with a central oval. This is the representation of a composition pattern. The two squares represent the roles of this composition pattern. Also, double-clicking on a composition pattern shows the documentation.