Exception New UML (#237)

System.NullReferenceException: Object reference not set to an instance of an object.

at SoftwareIdeasModeler.DiagramTools.FrameTool.CreateNewUmlEntity()

at SoftwareIdeasModeler.DiagramTools.BaseTools.EntityTool.MouseMove(EnhancedMouseEventArgs e)

at SoftwareIdeasModeler.SimDiagramControl.canvas_MouseMove(Object sender, MouseEventArgs e)

at System.Windows.Forms.Control.WmMouseMove(Message& m)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)