diff --git a/src/adaptors/UBCFFSubsetAdaptor.cpp b/src/adaptors/UBCFFSubsetAdaptor.cpp
index 7eb667b5..87c83cc4 100644
--- a/src/adaptors/UBCFFSubsetAdaptor.cpp
+++ b/src/adaptors/UBCFFSubsetAdaptor.cpp
@@ -174,9 +174,7 @@ bool UBCFFSubsetAdaptor::UBCFFSubsetReader::parseGSection(const QDomElement &ele
 
     QDomElement currentSvgElement = element.firstChildElement();
     while (!currentSvgElement.isNull()) {
-        if (!parseSvgElement(currentSvgElement))
-            return false;
-
+        parseSvgElement(currentSvgElement);
         currentSvgElement = currentSvgElement.nextSiblingElement();
     }
 
@@ -187,8 +185,8 @@ bool UBCFFSubsetAdaptor::UBCFFSubsetReader::parseGSection(const QDomElement &ele
     else 
     {
         delete mGSectionContainer;
-        mGSectionContainer = NULL;
     }
+    mGSectionContainer = NULL;
 
     return true;
 }
@@ -1189,8 +1187,6 @@ bool UBCFFSubsetAdaptor::UBCFFSubsetReader::persistScenes()
         UBGraphicsScene *tmpScene = UBSvgSubsetAdaptor::loadScene(mProxy, i);
         tmpScene->setModified(true);
         UBThumbnailAdaptor::persistScene(mProxy, tmpScene, i);
-        delete tmpScene;
-
         mCurrentScene->setModified(false);
     }
 
diff --git a/src/board/UBBoardController.cpp b/src/board/UBBoardController.cpp
index bcfc1ddd..3c56d617 100644
--- a/src/board/UBBoardController.cpp
+++ b/src/board/UBBoardController.cpp
@@ -1482,11 +1482,12 @@ void UBBoardController::ClearUndoStack()
         UBGraphicsItemUndoCommand *cmd = (UBGraphicsItemUndoCommand*)UBApplication::undoStack->command(i);
 
         // go through all added and removed objects, for create list of unique objects
+        // grouped items will be deleted by groups, so we don't need do delete that items.
         QSetIterator<QGraphicsItem*> itAdded(cmd->GetAddedList());
         while (itAdded.hasNext())
         {
             QGraphicsItem* item = itAdded.next();
-            if( !uniqueItems.contains(item) )
+            if( !uniqueItems.contains(item) && !(item->parentItem() && UBGraphicsGroupContainerItem::Type == item->parentItem()->type()))
                 uniqueItems.insert(item);
         }
 
@@ -1494,7 +1495,7 @@ void UBBoardController::ClearUndoStack()
         while (itRemoved.hasNext())
         {
             QGraphicsItem* item = itRemoved.next();
-            if( !uniqueItems.contains(item) )
+            if( !uniqueItems.contains(item) && !(item->parentItem() && UBGraphicsGroupContainerItem::Type == item->parentItem()->type()))
                 uniqueItems.insert(item);
         }
     }
@@ -1515,7 +1516,8 @@ void UBBoardController::ClearUndoStack()
         }
         if(!scene)
         {
-            mActiveScene->deleteItem(item);
+           if (!mActiveScene->deleteItem(item))
+               delete item;
         }
     }
 
diff --git a/src/domain/UBGraphicsGroupContainerItem.cpp b/src/domain/UBGraphicsGroupContainerItem.cpp
index bed3b219..10be1c4d 100644
--- a/src/domain/UBGraphicsGroupContainerItem.cpp
+++ b/src/domain/UBGraphicsGroupContainerItem.cpp
@@ -28,18 +28,12 @@ UBGraphicsGroupContainerItem::UBGraphicsGroupContainerItem(QGraphicsItem *parent
     setUuid(QUuid::createUuid());
 
     setData(UBGraphicsItemData::itemLayerType, QVariant(itemLayerType::ObjectItem)); //Necessary to set if we want z value to be assigned correctly
-
-
 }
 
 UBGraphicsGroupContainerItem::~UBGraphicsGroupContainerItem()
 {
-    foreach (QGraphicsItem *item, childItems())
-    {   
-        removeFromGroup(item);
-        if (item && item->scene())
-            item->scene()->removeItem(item);
-    }
+    if (mDelegate)
+        delete mDelegate;
 }
 
 void UBGraphicsGroupContainerItem::addToGroup(QGraphicsItem *item)
@@ -83,6 +77,8 @@ void UBGraphicsGroupContainerItem::addToGroup(QGraphicsItem *item)
 
     QTransform newItemTransform(itemTransform);
     item->setPos(mapFromItem(item, 0, 0));
+
+    item->scene()->removeItem(item);
     item->setParentItem(this);
 
     // removing position from translation component of the new transform
@@ -113,10 +109,12 @@ void UBGraphicsGroupContainerItem::removeFromGroup(QGraphicsItem *item)
 {
     if (!item) {
         qDebug() << "can't specify the item because of the null pointer";
+        return;
     }
 
-    UBGraphicsScene *groupScene = scene();
-    if (groupScene) {
+    UBCoreGraphicsScene *groupScene = corescene();
+    if (groupScene)
+    {    
         groupScene->addItemToDeletion(item);
     }
 
@@ -170,9 +168,9 @@ void UBGraphicsGroupContainerItem::paint(QPainter *painter, const QStyleOptionGr
 //    }
 }
 
-UBGraphicsScene *UBGraphicsGroupContainerItem::scene()
+UBCoreGraphicsScene *UBGraphicsGroupContainerItem::corescene()
 {
-    UBGraphicsScene *castScene = dynamic_cast<UBGraphicsScene*>(QGraphicsItem::scene());
+    UBCoreGraphicsScene *castScene = dynamic_cast<UBCoreGraphicsScene*>(QGraphicsItem::scene());
 
     return castScene;
 }
@@ -218,15 +216,7 @@ void UBGraphicsGroupContainerItem::setUuid(const QUuid &pUuid)
 
 void UBGraphicsGroupContainerItem::destroy() {
 
-    UBGraphicsScene *groupScene = scene();
-
-
     foreach (QGraphicsItem *item, childItems()) {
-
-        if (groupScene) {
-            groupScene->addItemToDeletion(item);
-        }
-
         pRemoveFromGroup(item);
         item->setFlag(QGraphicsItem::ItemIsSelectable, true);
         item->setFlag(QGraphicsItem::ItemIsFocusable, true);
@@ -327,6 +317,12 @@ void UBGraphicsGroupContainerItem::pRemoveFromGroup(QGraphicsItem *item)
     item->setParentItem(newParent);
     item->setPos(oldPos);
 
+    UBGraphicsScene *Scene = dynamic_cast<UBGraphicsScene *>(item->scene());
+    if (Scene)
+    {    
+        Scene->addItem(item);
+    }
+
     // removing position from translation component of the new transform
     if (!item->pos().isNull())
         itemTransform *= QTransform::fromTranslate(-item->x(), -item->y());
diff --git a/src/domain/UBGraphicsGroupContainerItem.h b/src/domain/UBGraphicsGroupContainerItem.h
index 535627eb..00f643d3 100644
--- a/src/domain/UBGraphicsGroupContainerItem.h
+++ b/src/domain/UBGraphicsGroupContainerItem.h
@@ -4,6 +4,7 @@
 #include <QGraphicsItem>
 
 #include "domain/UBItem.h"
+#include "frameworks/UBCoreGraphicsScene.h"
 
 class UBGraphicsGroupContainerItem : public QGraphicsItem, public UBItem, public UBGraphicsItem
 {
@@ -23,7 +24,7 @@ public:
 
     virtual UBGraphicsItemDelegate* Delegate() const { return mDelegate;}
 
-    virtual UBGraphicsScene* scene();
+    virtual UBCoreGraphicsScene *corescene();
     virtual UBGraphicsGroupContainerItem *deepCopy() const;
     virtual void copyItemParameters(UBItem *copy) const;
 
diff --git a/src/domain/UBGraphicsItemDelegate.cpp b/src/domain/UBGraphicsItemDelegate.cpp
index 4abeb1a2..6c0349e4 100644
--- a/src/domain/UBGraphicsItemDelegate.cpp
+++ b/src/domain/UBGraphicsItemDelegate.cpp
@@ -113,7 +113,6 @@ UBGraphicsItemDelegate::UBGraphicsItemDelegate(QGraphicsItem* pDelegated, QObjec
     , mFlippable(false)
     , mToolBarUsed(useToolBar)
 {
-    // NOOP
     connect(UBApplication::boardController, SIGNAL(zoomChanged(qreal)), this, SLOT(onZoomChanged()));
 }
 
@@ -167,7 +166,7 @@ void UBGraphicsItemDelegate::init()
 
 UBGraphicsItemDelegate::~UBGraphicsItemDelegate()
 {
-    qDeleteAll(mButtons);
+    disconnect(UBApplication::boardController, SIGNAL(zoomChanged(qreal)), this, SLOT(onZoomChanged()));
     // do not release mMimeData.
     // the mMimeData is owned by QDrag since the setMimeData call as specified in the documentation
 }
diff --git a/src/domain/UBGraphicsScene.cpp b/src/domain/UBGraphicsScene.cpp
index b4cbfc4e..a982a2d1 100644
--- a/src/domain/UBGraphicsScene.cpp
+++ b/src/domain/UBGraphicsScene.cpp
@@ -305,7 +305,10 @@ UBGraphicsScene::~UBGraphicsScene()
 {
     if (mCurrentStroke)
         if (mCurrentStroke->polygons().empty())
+        {
             delete mCurrentStroke;
+            mCurrentStroke = NULL;
+        }
 
     if (mZLayerController)
         delete mZLayerController;
@@ -433,6 +436,11 @@ bool UBGraphicsScene::inputDevicePress(const QPointF& scenePos, const qreal& pre
         }
     }
 
+    if (mCurrentStroke && mCurrentStroke->polygons().empty()){
+        delete mCurrentStroke;    
+        mCurrentStroke = NULL;
+    }
+
     return accepted;
 }
 
@@ -474,6 +482,10 @@ bool UBGraphicsScene::inputDeviceMove(const QPointF& scenePos, const qreal& pres
                     UBCoreGraphicsScene::removeItemFromDeletion(mpLastPolygon);
                     mAddedItems.remove(mpLastPolygon);
                     mCurrentStroke->remove(mpLastPolygon);
+                    if (mCurrentStroke->polygons().empty()){
+                        delete mCurrentStroke;
+                        mCurrentStroke = NULL;
+                    }
                     removeItem(mpLastPolygon);
                     mPreviousPolygonItems.removeAll(mpLastPolygon);
                 }
@@ -1363,6 +1375,7 @@ UBGraphicsW3CWidgetItem* UBGraphicsScene::addOEmbed(const QUrl& pContentUrl, con
 UBGraphicsGroupContainerItem *UBGraphicsScene::createGroup(QList<QGraphicsItem *> items)
 {
     UBGraphicsGroupContainerItem *groupItem = new UBGraphicsGroupContainerItem();
+    addItem(groupItem);
 
     foreach (QGraphicsItem *item, items) {
         if (item->type() == UBGraphicsGroupContainerItem::Type) {
@@ -1373,13 +1386,14 @@ UBGraphicsGroupContainerItem *UBGraphicsScene::createGroup(QList<QGraphicsItem *
             }
             foreach (QGraphicsItem *chItem, childItems) {
                 groupItem->addToGroup(chItem);
+                mFastAccessItems.removeAll(item);
             }
         } else {
             groupItem->addToGroup(item);
+            mFastAccessItems.removeAll(item);
         }
     }
 
-    addItem(groupItem);
     groupItem->setVisible(true);
     groupItem->setFocus();
 
@@ -1396,6 +1410,15 @@ UBGraphicsGroupContainerItem *UBGraphicsScene::createGroup(QList<QGraphicsItem *
 void UBGraphicsScene::addGroup(UBGraphicsGroupContainerItem *groupItem)
 {
     addItem(groupItem);
+    for (int i = 0; i < groupItem->childItems().count(); i++)
+    {
+        QGraphicsItem *it = qgraphicsitem_cast<QGraphicsItem *>(groupItem->childItems().at(i));
+        if (it)
+        {
+             mFastAccessItems.removeAll(it);
+        }
+    }
+
     groupItem->setVisible(true);
     groupItem->setFocus();
 
@@ -2274,6 +2297,11 @@ void UBGraphicsScene::setToolCursor(int tool)
     {
         deselectAllItems();
     }
+
+    if (mCurrentStroke && mCurrentStroke->polygons().empty()){
+        delete mCurrentStroke;
+    }
+    mCurrentStroke = NULL;
 }
 
 void UBGraphicsScene::initStroke(){
diff --git a/src/frameworks/UBCoreGraphicsScene.cpp b/src/frameworks/UBCoreGraphicsScene.cpp
index fd4948ec..1f306425 100644
--- a/src/frameworks/UBCoreGraphicsScene.cpp
+++ b/src/frameworks/UBCoreGraphicsScene.cpp
@@ -30,12 +30,23 @@ UBCoreGraphicsScene::UBCoreGraphicsScene(QObject * parent)
 UBCoreGraphicsScene::~UBCoreGraphicsScene()
 {
     //we must delete removed items that are no more in any scene
-    foreach (const QGraphicsItem* item, mItemsToDelete)
+    //at groups deleting some items can be added to mItemsToDelete, so we need to use iterators.
+    if (mItemsToDelete.count())
     {
-        if (item->scene() == NULL || item->scene() == this)
+        QSet<QGraphicsItem *>::iterator it = mItemsToDelete.begin();
+        QGraphicsItem* item = *it;
+        do 
         {
-            delete item;
-        }
+            item = *it;
+            if (item && (item->scene() == NULL || item->scene() == this))
+            {
+                mItemsToDelete.remove(*it);
+                delete item;
+            }
+
+            it = mItemsToDelete.begin();
+
+        }while(mItemsToDelete.count());
     }
 }
 
@@ -46,9 +57,7 @@ void UBCoreGraphicsScene::addItem(QGraphicsItem* item)
             removeItemFromDeletion(curItem);
         }
     }
-
-    mItemsToDelete << item;
-
+ 
     if (item->scene() != this)
         QGraphicsScene::addItem(item);
 }
@@ -59,9 +68,7 @@ void UBCoreGraphicsScene::removeItem(QGraphicsItem* item, bool forceDelete)
     QGraphicsScene::removeItem(item);
     if (forceDelete)
     {
-        mItemsToDelete.remove(item);
-        delete item;
-        item = 0;
+        deleteItem(item);
     }
 }