Add a generic popup dialog

gui/dialogs/popup.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0"?>
+<!--
+ This file is part of FlightGear, the free flight simulator
+ http://www.flightgear.org/
+
+ Copyright (C) 2009 Torsten Dreyer, Torsten (at) t3r _dot_ de
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ General Public License for more details.
+-->
+
+<PropertyList>
+
+   <name>popup</name>
+
+   <width>500</width>
+   <height>100</height>
+   <modal>false</modal>
+   <draggable>true</draggable>
+   <resizable>true</resizable>
+
+   <text>
+    <x>10</x>
+    <y>70</y>
+    <label>Hello, world</label>
+    <color>
+     <red>1.0</red>
+     <green>1.0</green>
+     <blue>0.0</blue>
+    </color>
+   </text>
+
+   <button>
+    <x>240</x>
+    <y>10</y>
+    <legend>Close</legend>
+    <binding>
+     <command>dialog-close</command>
+    </binding>
+   </button>
+
+</PropertyList>