Index: umc/js/appcenter.js
===================================================================
--- umc/js/appcenter.js	(Revision 66116)
+++ umc/js/appcenter.js	(Arbeitskopie)
@@ -125,8 +125,8 @@
 
 		_getModuleStateAttr: function() {
 			var state = [];
-			var _selectedWidget = lang.getObject('selectedChildWidget', false, this)
-			var _app = lang.getObject('selectedChildWidget.app', false, this)
+			var _selectedWidget = lang.getObject('selectedChildWidget', false, this);
+			var _app = lang.getObject('selectedChildWidget.app', false, this);
 			if (_selectedWidget == this._appCenterPage) {
 				state = ['category', this._appCenterPage._searchSidebar.get('category')];
 			} else if (_app) {
@@ -177,7 +177,7 @@
 
 		showApp: function(app) {
 			topic.publish('/umc/actions', this.moduleID, this.moduleFlavor, app.id, 'show');
-			tools.umcpCommand('appcenter/ping')
+			tools.umcpCommand('appcenter/ping');
 			//this.standby(true);
 			var appDetailsDialog = new AppDetailsDialog({
 				moduleID: this.moduleID,
@@ -208,6 +208,7 @@
 				detailsDialog: appDetailsDialog,
 				configDialog: appConfigDialog,
 				hostDialog: appChooseHostDialog,
+				visibleApps: this._appCenterPage.getVisibleApps(),
 				udmAccessible: this.udmAccessible(),
 				standby: lang.hitch(this, 'standby'),
 				standbyDuring: lang.hitch(this, 'standbyDuring'),
Index: umc/js/appcenter/AppCenterPage.js
===================================================================
--- umc/js/appcenter/AppCenterPage.js	(Revision 66116)
+++ umc/js/appcenter/AppCenterPage.js	(Arbeitskopie)
@@ -181,6 +181,19 @@
 			return deferred;
 		},
 
+		getVisibleApps: function() {
+			// to show prev or next app on the AppDetailsPage
+			// we need all currently visible apps
+			var visibleApps = [];
+			array.forEach(this.metaCategories, function(metaCategory) {
+				if (metaCategory.grid.store) { // undefined if reloading AppDetailsPage
+					var apps = metaCategory.grid.store.query(metaCategory.filterQuery);
+					visibleApps = visibleApps.concat(apps);
+				}
+			});
+			return visibleApps;
+		},
+
 		getApplications: function() {
 			if (!this._applications) {
 				return tools.umcpCommand('appcenter/query', {}).then(lang.hitch(this, function(data) {
Index: umc/js/appcenter/AppDetailsPage.js
===================================================================
--- umc/js/appcenter/AppDetailsPage.js	(Revision 66116)
+++ umc/js/appcenter/AppDetailsPage.js	(Arbeitskopie)
@@ -110,14 +110,6 @@
 			this.own(this._progressBar);
 			this._grid = new AppCenterGallery({});
 			this.own(this._grid);
-
-			this.headerButtons = [{
-				name: 'close',
-				iconClass: this.isSubPage ? 'umcArrowLeftIconWhite' : 'umcCloseIconWhite',
-				label: this.backLabel,
-				align: 'left',
-				callback: lang.hitch(this, 'onBack')
-			}];
 		},
 
 		_setAppAttr: function(app) {
@@ -206,6 +198,43 @@
 			return buttons;
 		},
 
+		getHeaderButtons: function() {
+			var buttons = [{
+				name: 'close',
+				iconClass: this.isSubPage ? 'umcArrowLeftIconWhite' : 'umcCloseIconWhite',
+				label: this.backLabel,
+				align: 'left',
+				callback: lang.hitch(this, 'onBack')
+			}];
+
+			if (this.visibleApps && this.visibleApps.length) {
+				var currentIndex = -1;
+				array.some(this.visibleApps, lang.hitch(this, function(iapp, idx) {
+					currentIndex = iapp.id === this.app.id ? idx : undefined;
+					return currentIndex >= 0;
+				}));
+				var prevApp = this.visibleApps[currentIndex - 1];
+				var nextApp = this.visibleApps[currentIndex + 1];
+				buttons.push({
+					name: 'prev',
+					iconClass: 'umcLeftIconWhite',
+					label: prevApp ? _('Previous app') : '',
+					align: 'left',
+					disabled: !prevApp,
+					callback: lang.hitch(this, 'set', 'app', prevApp)
+				});
+				buttons.push({
+					name: 'next',
+					iconClass: 'umcRightIconWhite',
+					label: nextApp ? _('Next app') : '',
+					align: 'left',
+					disabled: !nextApp,
+					callback: lang.hitch(this, 'set', 'app', nextApp)
+				});
+			}
+			return buttons;
+		},
+
 		getActionButtons: function() {
 			var buttons = [];
 			if (this.app.canInstall) {
@@ -382,6 +411,7 @@
 			}
 
 			this.set('navButtons', this.getButtons());
+			this.set('headerButtons', this.getHeaderButtons());
 			this._navButtons.set('style', {'margin-left': '-0.2em', 'margin-top': '1em'});
 			this._navHeaderButtonContainer.addChild(this._navButtons);
 
@@ -551,13 +581,13 @@
 					});
 					for (var i = 0; i < rating.value; i++) {
 						domConstruct.create('div', {
-								'class': 'umcAppRatingIcon',
+								'class': 'umcAppRatingIcon'
 							}, ratingText.domNode
 						);
 					}
 					domConstruct.create('div', {
 							'class': 'umcAppRatingText',
-							textContent: rating.label,
+							textContent: rating.label
 						}, ratingText.domNode
 					);
 					domConstruct.create('div', {