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subclass listbox of combobox

I would like subclass the listbox of a combobox, i have tried this code but it didn't work, could you please help me.
bool hSubclassedListBox = false;
LRESULT CALLBACK WindowProcedureEdit5(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
HWND tmphwnd=(HWND)lParam;
g_oldEditProc6 = (WNDPROC)SetWindowLong((HWND)lParam, GWL_WNDPROC, long(WindowProcedureEdit6));
/*style = GetWindowLong((HWND)lParam, GWL_STYLE);
g_oldEditProc6 = (WNDPROC)SetWindowLong((HWND)lParam, GWL_STYLE, style);*/
//return 0L;

return CallWindowProc(g_oldEditProc5, hwnd, message, wParam, lParam);
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