diff --git a/navalplanner-webapp/src/main/webapp/calendars/_edition.zul b/navalplanner-webapp/src/main/webapp/calendars/_edition.zul
index c67285eb8..5d5ba763f 100644
--- a/navalplanner-webapp/src/main/webapp/calendars/_edition.zul
+++ b/navalplanner-webapp/src/main/webapp/calendars/_edition.zul
@@ -1,7 +1,7 @@
 <window id="${arg.top_id}" title="${arg.title}" border="normal">
 
 
-<tabbox mold="accordion">
+<tabbox mold="accordion-lite">
     <tabs>
         <tab label="${i18n:_('Data')}" id="dataTab" />
         <tab label="${i18n:_('History')}"
diff --git a/navalplanner-webapp/src/main/webapp/common/css/navalpro_zk.css b/navalplanner-webapp/src/main/webapp/common/css/navalpro_zk.css
index f30bc8881..5427d55a7 100644
--- a/navalplanner-webapp/src/main/webapp/common/css/navalpro_zk.css
+++ b/navalplanner-webapp/src/main/webapp/common/css/navalpro_zk.css
@@ -175,4 +175,12 @@ table {
 
 .z-window-embedded {
    margin:10px;
-}
\ No newline at end of file
+}
+
+/* Hide inner second level embed window titles */
+.z-window-embedded
+.z-window-embedded
+.z-window-embedded
+.z-window-embedded-hl {
+    display:none;
+}