diff --git a/dialog.cpp b/dialog.cpp
index 0521f2ee2..36a525886 100644
--- a/dialog.cpp
+++ b/dialog.cpp
@@ -271,7 +271,7 @@ void DialogPrivate::checkBorders(bool updateMaskIfNeeded)
     }
 
     //decide if to disable the other borders
-    if (!extender && q->isVisible()) {
+    if (q->isVisible()) {
         QRect geom;
         if (applet) {
             geom = screenGeom;
@@ -298,6 +298,15 @@ void DialogPrivate::checkBorders(bool updateMaskIfNeeded)
 
     if (!extender) {
         background->getMargins(leftWidth, topHeight, rightWidth, bottomHeight);
+    } else {
+        FrameSvg::EnabledBorders disabledBorders = FrameSvg::NoBorder;
+        if (!(borders & FrameSvg::LeftBorder)) {
+            disabledBorders |= FrameSvg::LeftBorder;
+        }
+        if (!(borders & FrameSvg::RightBorder)) {
+            disabledBorders |= FrameSvg::RightBorder;
+        }
+        extender->d->setDisabledBordersHint(disabledBorders);
     }
 
     //kDebug() << leftWidth << topHeight << rightWidth << bottomHeight;
@@ -313,7 +322,7 @@ void DialogPrivate::checkBorders(bool updateMaskIfNeeded)
         }
 
         q->update();
-    } 
+    }
 
     resizeChecksWithBorderCheck = false;
 }
diff --git a/extenders/extender.cpp b/extenders/extender.cpp
index ef736e6ea..e03536d47 100644
--- a/extenders/extender.cpp
+++ b/extenders/extender.cpp
@@ -20,6 +20,7 @@
 #include "extender.h"
 
 #include <QAction>
+#include <QDesktopWidget>
 #include <QLabel>
 #include <QGraphicsSceneDragDropEvent>
 #include <QGraphicsGridLayout>
@@ -29,6 +30,7 @@
 #include "applet.h"
 #include "containment.h"
 #include "corona.h"
+#include "dialog.h"
 #include "extendergroup.h"
 #include "extenderitem.h"
 #include "framesvg.h"
@@ -626,6 +628,10 @@ FrameSvg::EnabledBorders Extender::enabledBordersForItem(ExtenderItem *item) con
         }
     }
 
+    //someone (i.e. a Dialog) told the extender to disable some border?
+    borders &= ~d->disabledBordersHint;
+
+
     return borders;
 }
 
@@ -633,6 +639,7 @@ ExtenderPrivate::ExtenderPrivate(Applet *applet, Extender *extender) :
     q(extender),
     applet(applet),
     background(new FrameSvg(extender)),
+    disabledBordersHint(FrameSvg::NoBorder),
     currentSpacerIndex(-1),
     spacerWidget(0),
     emptyExtenderMessage(QString()),
@@ -896,6 +903,18 @@ void ExtenderPrivate::viewportGeometryChanged(const QRectF &rect)
     }
 }
 
+void ExtenderPrivate::setDisabledBordersHint(const FrameSvg::EnabledBorders borders)
+{
+    if (disabledBordersHint == borders) {
+        return;
+    }
+
+    disabledBordersHint = borders;
+    foreach (Plasma::ExtenderItem *item, attachedExtenderItems) {
+        item->d->themeChanged();
+    }
+}
+
 bool Extender::isEmpty() const
 {
     //It's empty if it doesn't have items or has only group that are empty and autohide
diff --git a/private/extender_p.h b/private/extender_p.h
index 85786bc51..8acb23379 100644
--- a/private/extender_p.h
+++ b/private/extender_p.h
@@ -77,6 +77,7 @@ class ExtenderPrivate
         void adjustMinimumSize();
         void setPositionFromDragPosition(const QPointF &pos);
         ExtenderGroup *findGroup(const QString &name) const;
+        void setDisabledBordersHint(const FrameSvg::EnabledBorders borders);
 
         Extender *q;
 
@@ -85,6 +86,7 @@ class ExtenderPrivate
         QGraphicsWidget *mainWidget;
         QGraphicsLinearLayout *layout;
         FrameSvg *background;
+        FrameSvg::EnabledBorders disabledBordersHint;
 
         int currentSpacerIndex;
         Spacer *spacerWidget;