error al abrir diagrama (#2774)
System.NullReferenceException: Object reference not set to an instance of an object.
at SoftwareIdeasModeler.Core.Projecting.ConcreteDiagramElement.DrawRectangle(DiagramDrawer drawer, DrawingParameters param, RectangleF bounds, Int32 defaultRounding, Boolean suppressShadow, Single[] customBorderStyle, ItemStyle customStyle, Single borderWidthMultiplier)
at SoftwareIdeasModeler.Core.DiagramItems.Uml.ConcreteUmlClass`1.DrawElement(DiagramDrawer drawer, DrawingParameters param)
at SoftwareIdeasModeler.Core.Projecting.ConcreteDiagramElement.Draw(DiagramDrawer drawer, DrawingParameters param)
at SoftwareIdeasModeler.Core.DiagramRendering.DiagramDrawer.Draw(DiagramLayer layer, IConcreteDiagramElement item)
at SoftwareIdeasModeler.Core.DiagramRendering.DiagramDrawer.Draw(DiagramLayer layer, Rectangle clipArea)
at SoftwareIdeasModeler.Core.DiagramRendering.DiagramDrawer.Draw(Diagram diagram, Rectangle drawBounds)
at SoftwareIdeasModeler.SimDiagramControl.Canvas_Paint(Object sender, PaintEventArgs e)
at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(HWND hWnd, UInt32 msg, WPARAM wparam, LPARAM lparam)
OF=SoftwareIdeasModeler.MainForm
NoCmds