Exclude focus change using tab key in .NET application

Question

I have a very simple Windows application with several controls, a DataGridView and an Adobe PDF viewer. The application works great, except when you switch focus between controls, I regularly get the following exception.

System.AccessViolationException was unhandled
  Message="Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
  Source="System.Windows.Forms"
  StackTrace:
       at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
       at System.Windows.Forms.Control.DefWndProc(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.AxHost.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.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       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 Scan_Manager.Program.Main() in D:\Checkouts\Code\Scan Manager\Scan Manager\Program.cs:line 17
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 

Does anyone point me in the right direction?

Thanks Jon

Update

After the game a little more, this only happens when the Adobe control loses focus. I can get around a bit by disabling its Tabstop, but unfortunately, when I use LoadFile to load a PDF file, it focuses automatically (and then the application crashes when I exit)

Answer 1

, , , , COM- (, Adobe Acrobat Reader), , .

, , , , , .

, Acrobat Reader , WebBrowser DocumentSource PDF. WebBrowser, ( ) Internet Explorer, , Internet Explorer , .Net WinForms. , , , COM. , .

Answer 2

, , PreMessageFilter . , Adobe, . , Adobe PDF, , .

PreMessageFilter MSDN - http://msdn.microsoft.com/en-us/library/system.windows.forms.application.addmessagefilter(v=vs.110).aspx

VB.Net , . - http://msdeveloper.co.uk/net/item/102-adobe-viewer-for-winforms

, - - .