In most applications when you lay the curser on an icon a tool tip message pops up describing the function of the icon... is it possible to do this with an option, checkbox or command button in Excel?
I think it's not possible since VBA ActiveX controls (command buttons, etc.) don't have a ToolTip property, neither a StatusBarText nor a ControlHelpText properties like Access, for example.
You can only play with the MouseMove event of the involved control and with the one of the form, and show/hide previously hidden text labels that show the equivalent text to the ToolTip property required.