#! /bin/bash

export MAIN_DIALOG='
<vbox>
  <hbox>
    <text>
      <label>Combobox:</label>
    </text>
    <combobox>
      <variable>COMBOBOX</variable>
      <item>First item</item>
      <item>Second item</item>
      <item>Third item</item>
    </combobox>
  </hbox>
  <hbox>
   <button ok></button>
   <button cancel></button>
  </hbox>
 </vbox>
'

gtkdialog --program=MAIN_DIALOG