diff --git a/embedded/fullscreen-toggle.svg b/embedded/fullscreen-toggle.svg
new file mode 100644
index 00000000..0ba6a88e
--- /dev/null
+++ b/embedded/fullscreen-toggle.svg
@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Generator: Adobe Illustrator 14.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 43363)  -->
+
+<svg
+   xmlns:osb="http://www.openswatchbook.org/uri/2009/osb"
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
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+   y="0px"
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+   height="18px"
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+   inkscape:pageopacity="0.0"
+   inkscape:pageshadow="2"
+   inkscape:current-layer="svg2383"
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+   style="fill:#325ee2;fill-opacity:1;fill-rule:evenodd"
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+   style="color:#000000;fill:#325ee2;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.506809;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
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diff --git a/embedded/fullscreen.svg b/embedded/fullscreen.svg
new file mode 100644
index 00000000..0c5074e4
--- /dev/null
+++ b/embedded/fullscreen.svg
@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Generator: Adobe Illustrator 14.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 43363)  -->
+
+<svg
+   xmlns:osb="http://www.openswatchbook.org/uri/2009/osb"
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
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+   y="0px"
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+   height="18px"
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+   id="metadata3059"><rdf:RDF><cc:Work
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+   id="defs3048"><linearGradient
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+		<inkscape:perspective
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+   inkscape:persp3d-origin="16 : 10.666667 : 1">
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diff --git a/net/systemeD/potlatch2/EditController.as b/net/systemeD/potlatch2/EditController.as
index f70cc217..e6ce2bd5 100644
--- a/net/systemeD/potlatch2/EditController.as
+++ b/net/systemeD/potlatch2/EditController.as
@@ -201,7 +201,7 @@ package net.systemeD.potlatch2 {
 			Mouse.registerCursor(name, cursorData);
 		}
 
-        private function toggleSize():void {
+        public function toggleSize():void {
             if (maximised) {
                 if (minimiseFunction) {
                     ExternalInterface.call(minimiseFunction);
diff --git a/potlatch2.mxml b/potlatch2.mxml
index 2c51c570..326587f8 100644
--- a/potlatch2.mxml
+++ b/potlatch2.mxml
@@ -37,6 +37,9 @@
 			click="SaveManager.saveChanges(theMap.editableLayer.connection);" id="saveButton" enabled="false"/>
         <mx:Button id="helpButton" label="Help" click="new HelpDialog().init();" styleName="appBarButton" />
         <mx:Spacer width="40"/>
+        <mx:Button id="fullscreen" icon="@Embed('embedded/fullscreen.svg')" click="theController.toggleSize();" styleName="appBarButton"
+            enabled="{true}"
+            toolTip="Toggle fullscreen (M)" />
         <mx:Button id="undo" label="Undo" click="MainUndoStack.getGlobalStack().undo();" styleName="appBarButton"
             enabled="{MainUndoStack.getGlobalStack().canUndo()}"
             toolTip="{MainUndoStack.getGlobalStack().getUndoDescription() ? 'Undo '+MainUndoStack.getGlobalStack().getUndoDescription() : 'Undo last action'}" />