I am trying to insert an image in a JBUTTON using netbean 8.0 (see images).

The problem: Nothing appears in the Netbeans box, and as you can see the icons are there.

See image1 thru 3
Name:  imagen1.jpg
Views: 161
Size:  33.7 KBName:  imagen2.png
Views: 152
Size:  15.3 KBName:  imagen3.png
Views: 157
Size:  11.9 KB