How to minimize button width

Can someone explain how to make a new button occupy less width on the tool bar.

I have tried the drive bar from Gus and it is great but the "three button" buttons are wide. The label is "C:" for example and Minimize menu width is checked. But the button is still about 8 characters wide.

Thanks.

The button will be as wide as the widest label in the individual underlying (up to) 3 buttons. As a general rule I do not use any labels on the individual underlying 3 buttons, instead I always put my text for each of those buttons in the tip section.

I see it now. Thanks for the help.