<DHeublein> wrote in message news:218621@10.0.1.98...If I will show a messageBox in the event: C1TrueDBGrid.RowColChange i get the following error. This error occours only, if I click the next button of a C1DBNavigator. If I change the row in the grid with an click of the mouse to the next row, the messagebox is shown well. Both controls (DBNav and DBGrid) are bound to a dataset of a C1DataLibrary. Error - InnerExeption Message: "Fehler beim Erstellen des Fensterhandles." NativeErrorCode: 1400 Source: "System.Windows.Forms" StackTrace: bei System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp) bei System.Windows.Forms.Control.CreateHandle() bei System.Windows.Forms.ToolBar.CreateHandle() bei System.Windows.Forms.Control.RecreateHandleCore() bei System.Windows.Forms.Control.RecreateHandle() bei C1.Win.C1Input.HighlightingToolBar.DoRecreateHandle() bei C1.Win.C1Input.C1DbNavigator.a(Object A_0, ElapsedEventArgs A_1) C1.Win.C1Input.2 version: 2.0.20082.33217 best regards DHeublein http://helpcentral.componentone.com/cs/forums/p/79441/218621.aspx#218621