Problems loading a radiobox

Hi, I am using wxGlade to design my application. I load the xrc file and all 
the widgets without any problem.
I do it as the following example:
txtNick = (wx.TextCtrl)XmlResource.XRCCTRL(this,"txtNick", 
typeof(wx.TextCtrl));

But I can't load a RadioBox, I do the following:
test = (wx.RadioBox)XmlResource.XRCCTRL(this,"test",typeof(wx.RadioBox));

And I get the following error:
Unhandled Exception: System.MissingMethodException: Constructor not found.
in [0x00093] (at /cvs/1-mono/mcs/class/corlib/System/Activator.cs:182) 
System.Activator:CreateInstance (System.Type,object[],object[])
in [0x00008] (at /cvs/1-mono/mcs/class/corlib/System/Activator.cs:156) 
System.Activator:CreateInstance (System.Type,object[])
in <0x0009d> wx.Object:FindObject (intptr,System.Type)
in <0x00020> wx.Window:FindWindow (int,System.Type)
in <0x0002a> wx.XmlResource:XRCCTRL (wx.Window,string,System.Type)
in [0x00209] (at /home/raul/Compilar/lphantWx/Options.cs:56) 
lphantWx.OptionsDialog:.ctor (wx.Window,eLePhant.eDonkey.CInterfaceGateway)
in [0x00007] (at /home/raul/Compilar/lphantWx/lphantwx.cs:34) 
lphantWx.lphantFrame:OnbtnOptions (object,wx.Event)
in <0x00069> (wrapper delegate-invoke) 
System.MulticastDelegate:invoke_void_object_Event (object,wx.Event)
in <0x0038c> wx.EvtHandler:MarshalEvent (intptr,int)
in <0x0006f> (wrapper native-to-managed) wx.EvtHandler:MarshalEvent 
(intptr,int)
in (unmanaged) (wrapper managed-to-native) wx.App:wxApp_Run (int,string[])
in <0x00004> (wrapper managed-to-native) wx.App:wxApp_Run (int,string[])
in <0x00021> wx.App:Run ()
in [0x00007] (at /home/raul/Compilar/lphantWx/lphantwx.cs:68) 
lphantWx.lphantWx:Main ()

Did I something wrong or is this a possible bug?
I am using wxWidgets for .NET 0.5 with Mono 1.0.1

Cheers,

Raúl

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