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{"Object reference not set to an instance of an object."}

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ComboBox and ListBox (obsolete as of Q2 2010)
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Alexandre
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Alexandre asked on 11 Jun 2009, 01:35 PM
Hi , I'm curently writing an 100% keyboard application and I got some trouble when I set the focus like this: MyCombobox.ComboBoxElement.TextBoxElement.TextBoxItem.Focus() and with the multicolumncombobox: MyMulticolumnCombobox.MultiColumnComboBoxElement.TextBoxElement.TextBoxItem.Focus() It work fine but if after that I take mouse it throw me an exception with this stack trace:

"   at Telerik.WinControls.UI.PopupManager.OnMouseDown(Point cursorPos)\r\n   at Telerik.WinControls.UI.PopupManager.PreFilterMessage(Message& msg)\r\n   at System.Windows.Forms.Application.ThreadContext.ProcessFilters(MSG& msg, Boolean& modified)\r\n   at System.Windows.Forms.Application.ThreadContext.PreTranslateMessage(MSG& msg)\r\n   at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FPreTranslateMessage(MSG& msg)\r\n   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)\r\n   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)\r\n   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)\r\n   at System.Windows.Forms.Application.Run(ApplicationContext context)\r\n   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()\r\n   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()\r\n   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)\r\n   at DPARS_POS.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81\r\n   at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)\r\n   at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)\r\n   at System.Runtime.Hosting.ManifestRunner.Run(Boolean checkAptModel)\r\n   at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()\r\n   at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData)\r\n   at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext)\r\n   at System.Activator.CreateInstance(ActivationContext activationContext)\r\n   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()\r\n   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)\r\n   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)\r\n   at System.Threading.ThreadHelper.ThreadStart()"


Hope you will be able to help me
Thanks
Alexandre Samson

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Alexandre
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answered on 11 Jun 2009, 01:37 PM
Sorry I forgot that it's when a click somewhere else in my form
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Nick
Telerik team
answered on 12 Jun 2009, 08:26 AM
Hi Alexandre,

I tried to reproduce the bug unsuccessfully. However we are very eager to help you further with that. Please send us a sample application reproducing the case. You need to open a new support ticket so that you can attach files. Than you very much in advance.

Regards,
Nick
the Telerik team

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ComboBox and ListBox (obsolete as of Q2 2010)
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