Note 12. června 2012:15:22

//Verze 2.2012.164.13
//PKOPECKY-PC
//Windows 7 x86 Service Pack 1 v6.1.7601
//12.6.2012 15:22:15

System.InvalidOperationException: Entering state 'GetObjectsNonReenterant' from state 'GetObjectsNonReenterant' is prohibited due to state 'GetObjectsNonReenterant' for ' [DevExpress.Xpo.UnitOfWork](54)'. Most probably, you are trying to initiate an object loading operation while the previous object loading operation is not yet completed. Postpone your operation until the Session.ObjectsLoaded or IXPObject.OnLoaded event is fired (while Session.IsObjectsLoading is true). Another cause of this exception is that you are trying to work simultaneously with the same session from different threads.
   v DevExpress.Xpo.Helpers.SessionStateStack.ThrowIfCantEnter(Session session, SessionState newState)
   v DevExpress.Xpo.Helpers.SessionStateStack.Enter(Session session, SessionState newState)
   v DevExpress.Xpo.Helpers.ObjectCollectionLoader.LoadObjects(ObjectsQuery[] queries)
   v DevExpress.Xpo.SimpleObjectLayer.LoadObjects(Session session, ObjectsQuery[] queries)
   v DevExpress.Xpo.Session.GetObjectsInternal(ObjectsQuery[] queries)
   v DevExpress.Xpo.Session.<>c__DisplayClasse.<GetObjects>b__c()
   v DevExpress.Xpo.Logger.LogManager.Log[T](String category, LogHandler`1 handler, MessageHandler`1 createMessageHandler)
   v DevExpress.Xpo.Session.GetObjects(ObjectsQuery[] queries)
   v DevExpress.Xpo.Session.GetObjects(ObjectsQuery query)
   v DevExpress.Xpo.XPBaseCollection.Load()
   v DevExpress.Xpo.XPBaseCollection.get_Objects()
   v DevExpress.Xpo.XPBaseCollection.get_Count()
   v DevExpress.Data.Helpers.ListDataControllerHelper.DevExpress.Data.IRelationList.IsMasterRowEmpty(Int32 listSourceRow, Int32 relationIndex)
   v DevExpress.Data.DataController.IsDetailRowEmpty(Int32 controllerRow, Int32 relationIndex)
   v DevExpress.Data.DataController.IsDetailRowEmptyCached(Int32 controllerRow, Int32 relationIndex)
   v DevExpress.XtraGrid.Views.Grid.GridView.IsMasterRowEmptyCached(Int32 rowHandle)
   v DevExpress.XtraGrid.Views.Grid.ViewInfo.GridViewInfo.CreateRowInfo(GridRow row)
   v DevExpress.XtraGrid.Views.Grid.ViewInfo.GridViewInfo.CalcRowsDrawInfo()
   v DevExpress.XtraGrid.Views.Grid.ViewInfo.GridViewInfo.CalcGridInfo()
   v DevExpress.XtraGrid.Views.Grid.ViewInfo.GridViewInfo.Calc(Graphics g, Rectangle bounds)
   v DevExpress.XtraGrid.Views.Base.ColumnView.DoInternalLayout()
   v DevExpress.XtraGrid.Views.Base.ColumnView.CalculateLayout()
   v DevExpress.XtraGrid.Views.Base.BaseView.CalculateLayoutSynchronized()
   v DevExpress.XtraGrid.Views.Base.BaseView.CheckViewInfo()
   v DevExpress.XtraGrid.Views.Base.BaseView.Draw(GraphicsCache e)
   v DevExpress.XtraGrid.GridControl.OnPaint(PaintEventArgs e)
   v System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)
   v System.Windows.Forms.Control.WmPaint(Message& m)
   v System.Windows.Forms.Control.WndProc(Message& m)
   v DevExpress.XtraEditors.Container.EditorContainer.WndProc(Message& m)
   v DevExpress.XtraGrid.GridControl.WndProc(Message& m)
   v System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   v System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   v System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)