Facing problem when STA thread joins MTA thread

HI Friends, I am facing a problem while joining a STA thread to MTA thread. Actually the requirement was some thing like describe below. 1. I have a exe which is using some dialog boxes. 2. These dialog boxes are using MSFlexGrid. This component is a Com component. 3.so in order to run it with Vb.Net exe i had to run this dialog box in a STA thread. 4. to achive this i created a new thread and set the Apartment status STA. 5.it was working fine when i run the code. but if click on exe than at the time of join it throws an unhandled exception.if i click on continue button of exception dialog box it runs successfully. how ever i can not ignore this exception. 6. exception contains below text (i know its a bog message but i am stuck here for last couple of days.). ************** Exception Text ************** System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. at MSFlexGridLib.IMSFlexGrid.get_Text() at AxMSFlexGridLib.AxMSFlexGrid.get_Text() at System.Windows.Forms.Control.OnHandleDestroyed(EventArgs e) at System.Windows.Forms.AxHost.DetachWindow() at System.Windows.Forms.AxHost.DetachAndForward(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.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) 7. COde snippet is like below. Dim paramtThread As New Threading.ParameterizedThreadStart(AddressOf DelgInvoke) Dim exeThread As New Threading.Thread(paramtThread) exeThread.SetApartmentState(Threading.ApartmentState.STA) exeThread.Start(mbrs)// mbrs is a structure variable. exeThread.Join() Please let me know if any one have any idea. i am totaly clueless here. it would be a great help.