fgdata/gui/dialogs/sound.xml

<?xml version="1.0"?>

<!-- Sound control dialog -->

<!--
     /sim/sound/pause
     /sim/sound/volume
  -->

<PropertyList>
 <name>sound-dialog</name>
 <layout>vbox</layout>

 <text>
  <label>Sound Configuration</label>
 </text>

 <checkbox>
   <label>Mute Sound</label>
   <property>/sim/sound/pause</property>
   <binding>
     <command>dialog-apply</command>
   </binding>
 </checkbox>

 <group>
  <layout>hbox</layout>
  <text><label>Volume:</label></text>
  <slider>
   <property>/sim/sound/volume</property>
  </slider>
  <!-- This doesn't work: need to find out why and fix it. -Andy -->
  <binding>
    <command>dialog-apply</command>
  </binding>
 </group>

  <group>
    <layout>hbox</layout>
    <default-padding>10</default-padding>

    <button>
      <legend>OK</legend>
      <equal>true</equal>
      <binding>
        <command>dialog-apply</command>
      </binding>
      <binding>
        <command>dialog-close</command>
      </binding>
      <default>true</default>
    </button>
  </group>

</PropertyList>