You can extend the user-interface of VisualBots Simulator by taking advantage of the built-in ActiveX controls within Excel. Command buttons, options buttons, check boxes, list boxes, and edit boxes can be used to enhance user control over your simulations. The example below shows the use of scroll bar and check box objects to set the parameters for a fractal tree simulation. To access these controls, click on View > Toolbars > Control Toolbox on the worksheet menubar and consult Microsoft Excel help for more information.