Grouped items doesn't manages by mFastAccessItems now.

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);
         }
     }

src/domain/UBGraphicsGroupContainerItem.cpp

@@ -324,6 +324,12 @@ 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());

src/domain/UBGraphicsPolygonItem.cpp

@@ -67,8 +67,8 @@ void UBGraphicsPolygonItem::clearStroke()
 	if (mStroke!=NULL)
 	{
         mStroke->remove(this);
-        if (mStroke->polygons().empty())
-            delete mStroke;
+        //if (mStroke->polygons().empty())
+           // delete mStroke;
         mStroke = NULL;
 	}
 }

src/domain/UBGraphicsScene.cpp

@@ -1374,9 +1374,11 @@ UBGraphicsGroupContainerItem *UBGraphicsScene::createGroup(QList<QGraphicsItem *
             }
             foreach (QGraphicsItem *chItem, childItems) {
                 groupItem->addToGroup(chItem);
+                mFastAccessItems.removeAll(item);
             }
         } else {
             groupItem->addToGroup(item);
+            mFastAccessItems.removeAll(item);
         }
     }
 
@@ -1396,6 +1398,15 @@ 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();