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>
    <padding>10</padding>
  </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>
      <binding>
	<command>dialog-apply</command>
      </binding>
    </slider>
  </group>
  
  <group>
    <layout>hbox</layout>
    <default-padding>10</default-padding>

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

</PropertyList>