You can attach an icon to the stereotype you have defined in order to identify stereotyped instances of the metaclass. You can create your own icons or cursors using 3rd party editors or you can purchase them from graphic designers.
If you select the Palette Custom Tool check box, the icon is automatically initialized with the default system icon, which you can change with the browse tool.
When you select a new icon, this icon is copied and saved in the resource file. It is displayed in the list of icons available for the Custom Graphic Tools category in the Customize Toolbars dialog box: