[wxlua-users] In coroutine, can not get right value of a Extending classes member!

[Chunlin Z. <zha...@gm...>]

Dear all:
   I have just encountered this kind of issue,using wxlua in Lua for 
windows (LuaForWindows_v5.1.4-36).I extend class using the method 
mentioned in "Extending classes" of 
http://wxlua.sourceforge.net/docs/wxlua.html.
   In the attatchment of file "veryminimal.wx.wlua",I wrote a coroutine 
function in a button handler.
"""
function mainframe_on_button(self,event)
     print("---outside coroutine")
     print(self)
     print(self.button)
     print(self.textEntry)

     local function test_co_func()
         print("---inside coroutine")
         print(self)
         print(self.button)
         print(self.textEntry)
     end

     self.co = coroutine.create(test_co_func)

     local r,e = coroutine.resume(self.co)
     if (r == false) then
         print(r,e)
     end

end
"""
And the output is:
"""
---outside coroutine
userdata: 016454F8 [wxFrame(01645138, 186)]
userdata: 016462F0 [wxButton(01646160, 109)]
userdata: 01645D98 [wxTextCtrl(01645BA0, 337)]
---inside coroutine
userdata: 016454F8 [wxFrame(01645138, 186)]
button
textEntry
"""

Why can not access the right value in coroutine ?

Thanks!