To select an item in the Shelf Editor
To use a custom icon for a shelf item
A file browser appears.
The image must be in BMP, GIF, JPG, JPEG, PNG, PBM, PGM, PPM, XBM, SVG, or XPM format. PNG is the recommended format.
Due to the way that the interface handles transparency, you may notice messy borders around the edges of XPM images. To fix this, you must use an image format other than XPM. If you specify XPM, Maya automatically searches for a PNG of the same name before defaulting to XPM.
The standard size for a shelf icon is 32 x 32 pixels. If your image does not conform to this size, Maya scales it to fit.
To change the name of a shelf item as it appears in lists and tooltips
To overlay a short text label on an icon
The characters are overlayed on the icon.