fgdata/gui/dialogs/devel-extensions.xml

<?xml version="1.0"?>

<PropertyList>
	<name>devel-extensions</name>
	<modal>false</modal>
	<layout>vbox</layout>

	<text>
		<label>Configure Development Extensions</label>
	</text>

	<hrule/>

	<group>
		<layout>vbox</layout>
		<halign>center</halign>

		<checkbox>
			<halign>left</halign>
			<label>Enable development dialog widgets (HUD and rendering dialog)</label>
			<property>/sim/gui/devel-widgets</property>
			<binding>
				<command>dialog-apply</command>
			</binding>
		</checkbox>

		<checkbox>
			<halign>left</halign>
			<label>Enable '/'-key property handler (see $FG_ROOT/Nasal/prop-key-handler.nas)</label>
			<property>/sim/input/property-key-handler</property>
			<binding>
				<command>dialog-apply</command>
			</binding>
		</checkbox>
	</group>

	<button>
		<legend>Close</legend>
		<default>true</default>
		<key>Esc</key>
		<binding>
			<command>dialog-apply</command>
		</binding>
		<binding>
			<command>dialog-close</command>
		</binding>
	</button>
</PropertyList>