Raycasting - Raytracing help by interface

hi, i made an applet about raytracing, which is hanged on at pixellove.eu/wega

iam not skilled in doing interface in java, so i used the netBeans interface Designer
but i am experiencing this problems with the interface

If the jPanel1 is removed, the canvases keep overpainting the menu, see pixellove.eu/wega/overpaintingmenu.jpg

By clicking to menu, it acts, like it was pressed 2 times (adding 2 cubes, rendering 2 times…)

the code can be found here pixellove.eu/wega/notfullsource.zip

the bigger problem i have, is that all netBeans made applets kill my Firefox, which freezes to death, IE shows an X at the applet, any solution for this? thx

the source zip does not seem to exist…