fgdata/gui/dialogs/airports.xml

<?xml version="1.0"?>
<PropertyList>
  <name>airports</name>
  <layout>vbox</layout>

  <text>
    <label>Select an Airport</label>
  </text>

  <!-- The airport list widget appears to have a bug with layout; it 
       fails to draw within the x/y/width/height it is given. -->
  <airport-list>
    <pref-width>440</pref-width>
    <pref-height>360</pref-height>
    <property>/sim/presets/airport-id</property>
  </airport-list>

  <group>
    <layout>hbox</layout>
    <default-padding>10</default-padding>
    <empty><stretch>true</stretch></empty>

    <button>
      <legend>Apply</legend>
      <equal>true</equal>
      <default>true</default>
      <binding>
        <command>nasal</command>
        <script>
          setprop("/sim/presets/longitude-deg", -9999);
          setprop("/sim/presets/latitude-deg", -9999);
          setprop("/sim/presets/altitude-ft", -9999);
          setprop("/sim/presets/airspeed-kt", 0);
          setprop("/sim/presets/offset-distance", 0);
          setprop("/sim/presets/offset-azimuth", 0);
          setprop("/sim/presets/glideslope-deg", 0);
          setprop("/sim/presets/heading-deg", 0);
          setprop("/sim/presets/runway", "");
      </script>
      </binding>
      <binding>
        <command>dialog-apply</command>
      </binding>
      <binding>
        <command>presets-commit</command>
      </binding>
      <binding>
        <command>dialog-close</command>
      </binding>
    </button>

    <empty><stretch>true</stretch></empty>

    <button>
      <legend>Close</legend>
      <equal>true</equal>
      <binding>
	<command>dialog-close</command>
      </binding>
    </button>

    <empty><stretch>true</stretch></empty>
  </group>
</PropertyList>