This post is about the history of the LBSim. Below, you can see the progress of the graphical user interface of the program. It all started with a simple window, with a menu with commands and a dialog for configuration. After that, some panels were added to the interface. Later, dialogs were created for another functions. The next step was including a chart dialog. Following this version, the main window was altered to contain only two side panels. Finally, it was implemented a menu with the many available options.