I created a Demos topic in Webhelp (using RH X5 HTML) to
house all of the Flash movies referenced in other topics. I wanted
to create a "Demos" button in the Toolbar, so I went through the
wizard and chose two different graphics for "selected" and
"unselected"buttons. When I save the skin and "enable" this button
in the output, then publish the help, the demo button is displayed,
but when I click on it, it doesn't stay selected - only on
mouseover. Otherwise, the button is permanently "unselected".
You did nothing wrong. This is the way it works with custom
toolbar buttons. The others remain selected because the Navigation
pane changes. Usually a toolbar button you add does something
momentarily, like display a page of links that will also change
when your user clicks one of the links.