diff --git a/gui/dialogs/devel-extensions.xml b/gui/dialogs/devel-extensions.xml
index 6d6fcd3df..6441e3f2d 100644
--- a/gui/dialogs/devel-extensions.xml
+++ b/gui/dialogs/devel-extensions.xml
@@ -4,8 +4,69 @@
 	<name>devel-extensions</name>
 	<modal>false</modal>
 	<layout>vbox</layout>
+  <nasal>
+    <open>
+      <![CDATA[
+          var osg_debug = [
+            [0, "- Off"],
+            [1, "- Show Frame Rate"],
+            [2, "+ Viewer Graph"],
+            [3, "+ Camera"],
+            [4, "+ Viewer Scene"],
+          ];
+          var osg_stats = cmdarg().getChildren("group")[1].getChildren("combo")[0];
+          var i = 0;
+          
+          foreach (var s; osg_debug) {
+                    var nm = s[0] ~ " " ~ s[1];
+#print("setting node to ",nm);
+                    osg_stats.getNode("value[" ~ i ~ "]", 1).setValue(nm);
+                    if (i == getprop("/sim/rendering/on-screen-statistics"))
+                      setprop("/sim/gui/dialogs/devel-extensions/on-screen-statistics",nm);
+                    i += 1;
+                }
+  
+                var updateOSG_stats = func(n) {
+                  var sel_mode = n.getValue();
+                  if( sel_mode == nil ) return;
+                  print("\nupdate OSG debug ",sel_mode);
+  
+                  foreach (var s; osg_debug)
+                  {
+                    if(s[0] == sel_mode)
+                    {
+                    print(" >> ",s[1]);
+                    setprop("/sim/gui/dialogs/devel-extensions/on-screen-statistics", s[0] ~ " " ~ s[1]);
+                    gui.dialog_update("devel-extensions", "OSGdebug");
+                      break;
+                    }
+                  }
+#  print("OSG Debug ",getprop("/sim/gui/dialogs/devel-extensions/on-screen-statistics"));
+                };
+            
+            # listen for results arriving
+            setlistener("/sim/rendering/on-screen-statistics", updateOSG_stats);
+            ]]>
+    </open>
 
-	<text>
+    <close>
+    </close>
+  </nasal>
+  
+  <!--new debug dialog
+
+    multiplayer debug checkboxes
+    loopback
+    log outgoing properties 2
+    dump & 4
+    trace incoming properties.
+
+    log level / systems.
+
+    osg debug (0,1,2,3,4)
+
+    reload shaders.-->
+    <text>
 		<label>Configure Development Extensions</label>
 	</text>
 
@@ -13,7 +74,7 @@
 
 	<group>
 		<layout>vbox</layout>
-		<halign>center</halign>
+		<halign>left</halign>
 
 		<checkbox>
 			<halign>left</halign>
@@ -33,15 +94,167 @@
 			</binding>
 		</checkbox>
 	</group>
-	<button>
+    <group>
+        <layout>vbox</layout>
+
+        <!--muultiplayer debug checkboxes
+        loopback
+        log outgoing properties 2
+        dump & 4
+        trace incoming properties.-->
+        <halign>center</halign>
+        <checkbox>
+            <halign>left</halign>
+            <label>Local loopback of model</label>
+            <property>/sim/gui/debug/multiplayer-loopback</property>
+            <binding>
+                <command>dialog-apply</command>
+            </binding>
+            <binding>
+                <command>nasal</command>
+                <script>
+            <![CDATA[
+                    setprop("/sim/multiplay/debug-level", (getprop("/sim/multiplay/debug-level") or 0) ^ 1);
+                    setprop("/sim/gui/debug/multiplayer-loopback", getprop("/sim/multiplay/debug-level") & 1);
+            ]]>
+                </script>
+            </binding>
+        </checkbox>
+
+       <combo>
+        <row>5</row>
+        <col>1</col>
+        <pref-width>300</pref-width>
+        <halign>left</halign>
+        <name>OSGdebug</name>
+         <label>OSG statistics</label>
+         <property>/sim/gui/dialogs/devel-extensions/on-screen-statistics</property>
+        <editable>false</editable>
+        <binding>
+          <command>dialog-apply</command>
+        </binding>
+        <binding>
+          <command>nasal</command>
+          <script>
+            <![CDATA[
+            print("OSG Debug ",getprop("/sim/gui/dialogs/devel-extensions/on-screen-statistics"));
+              var selval = substr(getprop("/sim/gui/dialogs/devel-extensions/on-screen-statistics"),0,1);
+              print("Set osg debug ",selval);
+              setprop("/sim/rendering/on-screen-statistics", selval);
+            ]]>
+          </script>
+        </binding>
+      </combo>
+    </group>
+  <group>
+    <layout>hbox</layout>
+    <halign>center</halign>
+    <button>
 		<legend>New Canvas Map</legend>
 		<binding>
 			<command>nasal</command>
 			<script>canvas.MapStructure_selfTest();</script>
 		</binding>
-	</button>
+    </button>
+  </group>
+  <group>
+    <layout>hbox</layout>
+    <halign>left</halign>
+    <button>
+      <legend>Reload GUI</legend>
+      <name>reload-gui</name>
+      <binding>
+        <command>reinit</command>
+        <subsystem>gui</subsystem>
+      </binding>
+    </button>
+    <button>
+      <name>reload-input</name>
+      <legend>Reload Input</legend>
+      <binding>
+        <command>reinit</command>
+        <subsystem>input</subsystem>
+      </binding>
+    </button>
 
-	<button>
+    <button>
+      <name>reload-hud</name>
+      <legend>Reload Hud</legend>
+      <binding>
+        <command>reinit</command>
+        <subsystem>hud</subsystem>
+      </binding>
+    </button>
+
+    <button>
+      <name>reload-panel</name>
+      <legend>Reload Panel</legend>
+      <binding>
+        <command>panel-load</command>
+      </binding>
+    </button>
+  </group>
+  <group>
+    <layout>hbox</layout>
+    <halign>let</halign>
+    <button>
+      <name>reload-autopilot</name>
+      <legend>Reload Autopilot</legend>
+      <binding>
+        <command>reinit</command>
+        <subsystem>xml-autopilot</subsystem>
+      </binding>
+    </button>
+
+    <button>
+      <name>reload-network</name>
+      <legend>Reload Network</legend>
+      <binding>
+        <command>reinit</command>
+        <subsystem>io</subsystem>
+      </binding>
+    </button>
+
+    <button>
+      <name>reload-model</name>
+      <legend>Reload Aircraft Model</legend>
+      <binding>
+        <command>reinit</command>
+        <subsystem>aircraft-model</subsystem>
+      </binding>
+    </button>
+    
+  </group>
+  <group>
+    <layout>hbox</layout>
+    <halign>left</halign>
+    <button>
+      <name>reload-shaders</name>
+      <legend>Reload Shaders</legend>
+      <binding>
+        <command>reload-shaders</command>
+      </binding>
+    </button>
+    <button>
+      <name>reload-materials</name>
+      <legend>Reload Materials</legend>
+      <binding>
+        <command>reload-materials</command>
+      </binding>
+    </button>
+
+    <button>
+      <width>20</width>
+      <name>reload-scenery</name>
+      <legend>Reload Scenery</legend>
+      <binding>
+        <command>reinit</command>
+        <subsystem>scenery</subsystem>
+      </binding>
+    </button>
+
+  </group>
+  <button>
 		<legend>Close</legend>
 		<default>true</default>
 		<key>Esc</key>