cdTree VB Knowledge Solutions Categories This command allows the user to add, remove, edit or rename any category. The panel also allows the user to change the parent of a specific category by dragging the category and dropping it into another category. The required operation can be done, either through clicking on the appropriate button, or by right clicking the mouse on a specific directory, this will display a context sensitive menu of the possible actions. You can change the category images by using the category properties panel and selecting a different icon.