fgdata/gui/dialogs/message.xml

<?xml version="1.0"?>

<PropertyList>
	<name>message</name>
	<modal>false</modal>
	<layout>vbox</layout>
	<default-padding>6</default-padding>

	<group-template>
		<enabled>false</enabled>
		<layout>hbox</layout>
		<default-padding>0</default-padding>
		<text>
			<label>MESSAGE</label>
		</text>
		<empty><stretch>1</stretch></empty>
	</group-template>

	<group>
		<layout>hbox</layout>
		<default-padding>8</default-padding>
		<group>
			<layout>vbox</layout>
			<default-padding>0</default-padding>
		</group>
	</group>

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

	<nasal>
		<open>
			var self = cmdarg();
			var dlgname = self.getNode("name").getValue();
			var dlg = props.globals.getNode("/sim/gui/dialogs/" ~ dlgname, 1);
			var msg = dlg.getNode("message", 1).getValue();
			var textgroup = self.getNode("group-template");

			self.getNode("group/group").removeChildren("group");

			var lines = split("\n", msg);
			forindex (var i; lines) {
				var target = self.getNode("group/group").getChild("group", i, 1);
				props.copy(textgroup, target);
				target.getNode("text/label").setValue(lines[i]);
				target.getNode("enabled").setValue(1);
			}
		</open>

		<close>
			dlg.getParent().removeChild(dlg.getName(), dlg.getIndex());
		</close>
	</nasal>
</PropertyList>