Xamarin.iOS Crashs Without Any Exception

I'm using xamarin.iso indie version and xamarin studio to develop a small application. At begining, everything gos well, but after I add the search function which involves the UISearchDisplayController and UISearchDisplayDelegate, then I always get the application crash. everytime, if I search for the firs time, then it works, and the controller will be navigated back to the main controller, but when I go into the search controller again, the application will crash when I click on the button which will trigger the naviagation to search controller or when I input the search text on the search bar. The debugger doesn't pop up any exception or meesage, just disconected from the iPad. so I don't what's really wrong with my code.

I spend about one week on this code and changes any code that possible has the error, and add all try/catch to all the functions reladted, but none of them has a break when the application crash.

How can I do to get whats's really happened?

Thanks

I added the crash report: Incident Identifier: 4E7BF3F6-6C51-4F31-9FCA-BFBBFF4BA784 CrashReporter Key: d9f9b03f7f2af1d1b10851aec8a44d4127285508 Hardware Model: iPad3,4 Process: MODClientiOSModPad [300] Path: /var/mobile/Applications/2CBA3949-EF3E-4F85-98AC-439FEEC7CF07/MODClientiOSModPad.app/MODClientiOSModPad Identifier: MODClientiOSModPad Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1]

    Date/Time:       2013-06-03 23:09:16.965 +0800
    OS Version:      iOS 6.1.3 (10B329)
    Report Version:  104

    Exception Type:  EXC_CRASH (SIGABRT)
    Exception Codes: 0x0000000000000000, 0x0000000000000000
    Crashed Thread:  0

    Thread 0 name:  Dispatch queue: com.apple.main-thread
    Thread 0 Crashed:
    0   libsystem_kernel.dylib          0x39aac350 __pthread_kill + 8
    1   libsystem_c.dylib               0x39a22fb2 pthread_kill + 54
    2   libsystem_c.dylib               0x39a5f366 abort + 90
    3   MODClientiOSModPad              0x001b3796 0x1000 + 1779606
    4   MODClientiOSModPad              0x001ba5b4 0x1000 + 1807796
    5   libsystem_c.dylib               0x39a2cd38 _sigtramp + 40
    6   libsystem_c.dylib               0x39a22fb2 pthread_kill + 54
    7   libsystem_c.dylib               0x39a5f366 abort + 90
    8   MODClientiOSModPad              0x00196866 0x1000 + 1661030
    9   MODClientiOSModPad              0x001d98e2 0x1000 + 1935586
    10  MODClientiOSModPad              0x001e0cfe 0x1000 + 1965310
    11  MODClientiOSModPad              0x001e0e1a 0x1000 + 1965594
    12  MODClientiOSModPad              0x00205064 0x1000 + 2113636
    13  MODClientiOSModPad              0x00200b64 0x1000 + 2095972
    14  MODClientiOSModPad              0x00002024 0x1000 + 4132

    Thread 1 name:  Dispatch queue: com.apple.libdispatch-manager
    Thread 1:
    0   libsystem_kernel.dylib          0x39a9c5d0 kevent64 + 24
    1   libdispatch.dylib               0x399d7d22 _dispatch_mgr_invoke + 806
    2   libdispatch.dylib               0x399d3374 _dispatch_mgr_thread + 32

    Thread 2:
    0   libsystem_kernel.dylib          0x39aacd98 __workq_kernreturn + 8
    1   libsystem_c.dylib               0x399faad6 _pthread_workq_return + 14
    2   libsystem_c.dylib               0x399fa7f2 _pthread_wqthread + 362
    3   libsystem_c.dylib               0x399fa680 start_wqthread + 4

    Thread 3:
    0   libsystem_kernel.dylib          0x39aac494 __recvfrom + 20
    1   libsystem_c.dylib               0x39a05192 recv + 18
    2   MODClientiOSModPad              0x00201f50 0x1000 + 2101072
    3   MODClientiOSModPad              0x002035a4 0x1000 + 2106788
    4   MODClientiOSModPad              0x00203260 0x1000 + 2105952
    5   MODClientiOSModPad              0x00201d3c 0x1000 + 2100540
    6   MODClientiOSModPad              0x00200d9c 0x1000 + 2096540
    7   Foundation                      0x3204622c __NSThread__main__ + 968
    8   libsystem_c.dylib               0x39a050de _pthread_start + 306
    9   libsystem_c.dylib               0x39a04fa4 thread_start + 4

    Thread 4:
    0   libsystem_kernel.dylib          0x39aacd98 __workq_kernreturn + 8
    1   libsystem_c.dylib               0x399faad6 _pthread_workq_return + 14
    2   libsystem_c.dylib               0x399fa7f2 _pthread_wqthread + 362
    3   libsystem_c.dylib               0x399fa680 start_wqthread + 4

    Thread 5:
    0   libsystem_kernel.dylib          0x39aac494 __recvfrom + 20
    1   libsystem_c.dylib               0x39a05192 recv + 18
    2   MODClientiOSModPad              0x00201f50 0x1000 + 2101072
    3   MODClientiOSModPad              0x00202054 0x1000 + 2101332
    4   MODClientiOSModPad              0x0017e166 0x1000 + 1560934
    5   MODClientiOSModPad              0x0016d136 0x1000 + 1491254
    6   MODClientiOSModPad              0x0018f148 0x1000 + 1630536
    7   MODClientiOSModPad              0x001b0628 0x1000 + 1766952
    8   libsystem_c.dylib               0x39a050de _pthread_start + 306
    9   libsystem_c.dylib               0x39a04fa4 thread_start + 4

    Thread 0 crashed with ARM Thread State (32-bit):
        r0: 0x00000000    r1: 0x00000000      r2: 0x00000000      r3: 0x3b599524
        r4: 0x00000006    r5: 0x3b599b78      r6: 0x0021b34b      r7: 0x2fdff374
        r8: 0x0021af65    r9: 0x00000000     r10: 0x0021b398     r11: 0x011e5e30
        ip: 0x00000148    sp: 0x2fdff368      lr: 0x39a22fb7      pc: 0x39aac350
      cpsr: 0x00000010

    Binary Images:
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    0x2fe7a000 - 0x2fe9afff  dyld armv7s  <67efe80b9d863d6bb30fe51e6e17b070> /usr/lib/dyld
    0x3092a000 - 0x3092afff  Accelerate armv7s  <f4e8c4c464953429ab6bd3160aadd176> /System/Library/Frameworks/Accelerate.framework/Accelerate
    0x3092b000 - 0x30a68fff  vImage armv7s  <49d3cf19d0a23f4d836fc313e5fd6bab> /System/Library/Frameworks/Accelerate.framework/Frameworks/vImage.framework/vImage
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    0x30b56000 - 0x30e0cfff  libLAPACK.dylib armv7s  <30a3e7dd8c603a9d81b5e42704ba5971> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libLAPACK.dylib
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    0x399f4000 - 0x39a7afff  libsystem_c.dylib armv7s  <11bcf1060ec63c8b909a452e6f79be08> /usr/lib/system/libsystem_c.dylib
    0x39a7b000 - 0x39a81fff  libsystem_dnssd.dylib armv7s  <94fab309ed9b35cdbc075cdda221bc70> /usr/lib/system/libsystem_dnssd.dylib
    0x39a82000 - 0x39a9afff  libsystem_info.dylib armv7s  <195d8eeb7c3f31bd916c0b5611abc0e7> /usr/lib/system/libsystem_info.dylib
    0x39a9b000 - 0x39ab1fff  libsystem_kernel.dylib armv7s  <a6afa72d4ec335d79b63aa47114cc24a> /usr/lib/system/libsystem_kernel.dylib
    0x39ab2000 - 0x39acefff  libsystem_m.dylib armv7s  <faafc8292d4935c4a78233e1d0879e13> /usr/lib/system/libsystem_m.dylib
    0x39acf000 - 0x39addfff  libsystem_network.dylib armv7s  <137f48e279a83d7496659c8e3d3729d4> /usr/lib/system/libsystem_network.dylib
    0x39ade000 - 0x39ae5fff  libsystem_notify.dylib armv7s  <df14146497cb3fa0a002eedbed49da65> /usr/lib/system/libsystem_notify.dylib
    0x39ae6000 - 0x39ae7fff  libsystem_sandbox.dylib armv7s  <85e91e99abc03db88eddc665424090b4> /usr/lib/system/libsystem_sandbox.dylib
    0x39ae8000 - 0x39ae8fff  libunwind.dylib armv7s  <3b7ec561dbec3a199f09ea08a64e76ee> /usr/lib/system/libunwind.dylib
    0x39ae9000 - 0x39afefff  libxpc.dylib armv7s  <0562a59bdf8d3f7783e93f35d7e724a8> /usr/lib/system/libxpc.dylib