fgdata/gui/dialogs/location-on-ground.xml

<?xml version="1.0"?>
<PropertyList>
  <name>location-on-ground</name>
  <layout>vbox</layout>
  
  <text>
    <label>Set New Location</label>
  </text>
    
  <group>
    <layout>table</layout>
    <halign>center</halign>
    <text>
      <row>0</row><col>0</col>
      <label>Airport:</label>
    </text>
    <input>
      <row>0</row><col>1</col>
      <property>/sim/presets/airport-id</property>
    </input>
    <text>
      <row>1</row><col>0</col>
      <label>Runway:</label>
    </text>
    <input>
      <row>1</row><col>1</col>
      <property>/sim/presets/runway</property>
    </input>
  </group>

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

    <button>
      <legend>OK</legend>
      <default>true</default>
      <equal>true</equal>
      <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);
	</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>Cancel</legend>
      <equal>true</equal> 
      <binding>
	<command>dialog-close</command>
      </binding>
    </button>

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