Editing buttons in panel window

Is there a way to edit the default buttons in the panel window?  These buttons seem to have been introduced in 2009 and later.  I can see in the panel command a flag to include the buttons, but I would like to edit them/remove/add my own.

Yes its just a form layout with formlayouts for the sections and icontTextButto/iconTextCheckBoxes for as items. Stupid example that does not bind the button to the form layout.

for ($panel in `getPanel -type modelPanel`)
{
  string $main = `panel -q -control $panel`;
  string $ca[] = `layout -q -ca $main`;
  $ca = `layout -q -ca ($main+"|"+$ca[0]+"|modelEditorIconBar")`;
  setParent $ca[0];
  button;
}