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IDProjectCategoryView StatusDate SubmittedLast Update
6371Cross SectionGeneralPublicFeb 7th 2026 7:26 AMFeb 7th 2026 7:26 AM
ReporterNBug Reporter Assigned To 
Priority NormalSeverityCrashReproducibilityHave Not Tried
Status NewResolutionOpen 
ProjectionNoneETANone 
PlatformWin32NTOSMicrosoft Windows NT 6.2.9200.0OS Version6.2.9200.0
Product Version1.23.7.8 
Summary6371: Invalid Content: ActiveContent must be one of the visible contents, or null if there is no visible content. @ Void set_ActiveContent(WeifenLuo.WinFormsUI.Docking.IDockContent) @ WeifenLuo.WinFormsUI.Docking.DockPane
Description
Invalid Content: ActiveContent must be one of the visible contents, or null if there is no visible content. @ Void set_ActiveContent(WeifenLuo.WinFormsUI.Docking.IDockContent) @ WeifenLuo.WinFormsUI.Docking.DockPane

<SerializableException xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <ExtendedInformation>
    <HResult>-2146233079</HResult>
  </ExtendedInformation>
  <InnerExceptions />
  <Message>Invalid Content: ActiveContent must be one of the visible contents, or null if there is no visible content.</Message>
  <Source>WeifenLuo.WinFormsUI.Docking</Source>
  <StackTrace>   at WeifenLuo.WinFormsUI.Docking.DockPane.set_ActiveContent(IDockContent value)
   at WeifenLuo.WinFormsUI.Docking.DockContentHandler.Activate()
   at WeifenLuo.WinFormsUI.Docking.DockContentHandler.Show(DockPanel dockPanel)
   at WeifenLuo.WinFormsUI.Docking.DockContentHandler.Show()
   at WeifenLuo.WinFormsUI.Docking.DockContent.Show()
   at CrossSection.frmMain.CheckPanels()
   at CrossSection.frmMain.mCrossSectionWindow_TabChanged(Int32 tabIndex)
   at CrossSection.CrossSectionWindow.tabXS_SelectedIndexChanged(Object sender, EventArgs e)
   at System.Windows.Forms.TabControl.OnSelectedIndexChanged(EventArgs e)
   at System.Windows.Forms.TabControl.WmSelChange()
   at System.Windows.Forms.TabControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(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)</StackTrace>
  <TargetSite>Void set_ActiveContent(WeifenLuo.WinFormsUI.Docking.IDockContent) @ WeifenLuo.WinFormsUI.Docking.DockPane</TargetSite>
  <Type>System.InvalidOperationException</Type>
</SerializableException>
Additional Information
<Report xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <GeneralInfo>
    <CLRVersion>4.0.30319.42000</CLRVersion>
    <Crash>true</Crash>
    <DateTime>2/7/2026 1:25:22 PM</DateTime>
    <ExceptionMessage>Invalid Content: ActiveContent must be one of the visible contents, or null if there is no visible content.</ExceptionMessage>
    <ExceptionType>System.InvalidOperationException</ExceptionType>
    <HostApplication>HN32-18.exe</HostApplication>
    <HostApplicationVersion>1.23.7.8</HostApplicationVersion>
    <NBugVersion>1.2.1.1</NBugVersion>
    <TargetSite>Void set_ActiveContent(WeifenLuo.WinFormsUI.Docking.IDockContent) @ WeifenLuo.WinFormsUI.Docking.DockPane</TargetSite>
    <UserDescription />
  </GeneralInfo>
</Report>
TagsBug, Crash, NBug
Attached Files
Exception_134149443606161541.zip (1,958,238 bytes)
Installation Type

Activities