diff --git a/ui (gen4)/index.html b/ui (gen4)/index.html
index 6363eae5..56c23240 100755
--- a/ui (gen4)/index.html	
+++ b/ui (gen4)/index.html	
@@ -78,6 +78,15 @@
 	transition: none;
 }
 
+/* XXX think of a way not to use !important */
+.viewer.single-image-mode .ribbon {
+	-webkit-transition: none !important;
+	-moz-transition: none !important;
+	-ms-transition: none !important;
+	-o-transition: none !important;
+	transition: none !important;
+}
+
 
 /* DEBUG stuff... */
 .container-center {
diff --git a/ui (gen4)/lib/actions.js b/ui (gen4)/lib/actions.js
index 47c786e7..c0c3d38d 100755
--- a/ui (gen4)/lib/actions.js	
+++ b/ui (gen4)/lib/actions.js	
@@ -157,6 +157,9 @@ if(typeof(args2array) != 'function'){
 // 	  registered from the current object and up to the base action set
 // 	  will be fired.
 //
+// 	- an action will return the last deepest action's return, if that 
+// 	  return is null, then the action set is returned.
+//
 // NOTE: actions once defined do not depend on the inheritance hierarchy, 
 // 		other than the .getHandlers(..) method. If this method is not 
 // 		found in the inheritance chain (i.e. the link to MetaActions)
@@ -210,26 +213,29 @@ function Action(name, doc, ldoc, func){
 		var handlers = getHandlers.call(this, name)
 			.map(function(h){ return h.apply(that, args) })
 
+		// XXX use the last return as result...
+		var res = handlers.slice(-1)[0]
+
 		// NOTE: this action will get included and called by the code 
 		// 		above and below, so no need to explicitly call func...
 
 		// call handlers -- post phase...
 		// NOTE: post handlers need to get called last run pre first run post...
-		handlers.reverse().forEach(function(h){ 
+		handlers.reverse().forEach(function(h, i){ 
 			// function...
 			if(h instanceof Function){
-				//h.call(that, res)
-				h.call(that)
+				var r = h.call(that)
+				res = i == 0 ? r : res
 
 			// deferred...
 			} else if(h != null && h.resolve instanceof Function){
-				//h.resolve(res)
 				h.resolve()
+				res = i == 0 ? h : res
 			} 
 		})
 
-		//return res
-		return this
+		return res || this
+		//return this
 	}
 	meth.__proto__ = this.__proto__
 
diff --git a/ui (gen4)/lib/jli.js b/ui (gen4)/lib/jli.js
index ccf2050b..e960fe9f 100755
--- a/ui (gen4)/lib/jli.js	
+++ b/ui (gen4)/lib/jli.js	
@@ -117,6 +117,8 @@ var USE_3D_TRANSFORM = true
 //
 // NOTE: for single state toggling, 'none' will get passed to 
 // 		state_accessor to indicate an "empty" state...
+// NOTE: if elem is a function it will be called in the same context as
+// 		the toggler and is expected to return the element.
 //
 // XXX technically we do not need both elem and state_accessor here, the
 // 		later is enough, but as strict mode is not stable enough (sometimes
@@ -153,6 +155,8 @@ function makeToggler(elem, state_accessor, states, callback_a, callback_b){
 			var action = b == 'next' ? null : b
 		}
 
+		e = e instanceof Function ? e.call(this) : e
+
 		// XXX is this correct???
 		var args = args2array(arguments).slice(2)
 
diff --git a/ui (gen4)/ui.js b/ui (gen4)/ui.js
index d6673be0..893a179e 100755
--- a/ui (gen4)/ui.js	
+++ b/ui (gen4)/ui.js	
@@ -94,6 +94,9 @@ module.GLOBAL_KEYBOARD = {
 
 		// XXX testing...
 
+		Enter: 'toggleSingleImage',
+		B: 'toggleTheme',
+
 		Home: {
 			default: 'firstImage',
 			ctrl: 'firstGlobalImage',
diff --git a/ui (gen4)/viewer.js b/ui (gen4)/viewer.js
index 9de9cfa3..a3249093 100755
--- a/ui (gen4)/viewer.js	
+++ b/ui (gen4)/viewer.js	
@@ -572,10 +572,11 @@ actions.Actions(Client, {
 		function(){
 			toggleFullscreenMode() 
 		}],
-	toggleSingleImage: ['',
-		function(){
-			// XXX
-		}],
+	toggleSingleImage: ['Toggle single image view', 
+		// XXX this is wrong!!!
+		makeCSSClassToggler(
+			function(){ return this.ribbons.viewer }, 
+			'single-image-mode') ],
 	// XXX revise this...
 	showDevTools: ['',
 		function(){
@@ -584,6 +585,14 @@ actions.Actions(Client, {
 			}
 		}],
 
+	toggleTheme: ['', 
+		makeCSSClassToggler(
+			function(){ return this.ribbons.viewer }, 
+			[
+				'gray', 
+				'dark', 
+				'light'
+			]) ],
 
 	// align modes...
 	// XXX skip invisible ribbons (???)