The Overview and Selection samples should use the registerIconFromText function instead of the registerIcon function as some icons (or sometimes all of them) appear blank.
The Size sample has the large button selected initially, however, the igc-button-group initial size is --ig-size-medium.
registerIconFromTextfunction instead of theregisterIconfunction as some icons (or sometimes all of them) appear blank.largebutton selected initially, however, theigc-button-groupinitial size is--ig-size-medium.