Genexus

Estoy creando un user control para la herramienta dhtmlxscheduler, he agregado algunas propiedades y metodos adicionales a los que incluye por default, pero al agregarlo a mi web panel me arroja el siguiente error:

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Object reference not set to an instance of an object. (Artech.FrameworkDE)

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Product = GeneXus X Evolution 2 Trial

Version = 10.2.71147 U3

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Program Location:

   at Artech.FrameworkDE.Controls.PropertyGridEx.GetCategory(PropertyDescriptor property)

   at Artech.FrameworkDE.Controls.PropertyGridEx.GetPlace(PropertyDescriptor prop)

   at Artech.FrameworkDE.Controls.PropertyGridEx.set_InternalSelection(Object value)

   at Artech.FrameworkDE.Controls.PropertyGridEx.SetSelectedInternal(Object value)

   at Artech.FrameworkDE.Controls.PropertyGridEx.SetSelectedObject(Object object, Boolean readOnly)

   at Artech.Core.UI.Controls.PropertyInspector.set_SelectedObject(Object value)

   at Artech.Core.UI.Navigator.UpdatePropertyInspector(ISelectionContainer pSC)

   at Artech.Core.UI.Navigator.Application_Idle(Object sender, EventArgs e)

   at System.EventHandler.Invoke(Object sender, EventArgs e)

   at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)

   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)

   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)

   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)

   at System.Windows.Forms.Application.Run(Form mainForm)

   at Genexus.Win.GeneXusMain.Main(String[] args)

Soy nueva utilizando esta herramienta y no la causa de este error, si alguien pudiese orientarme se los agradeceria mucho.