ShowModal not triggering the conditional statement for the dialog

Question

I am calling a dialog from a tree control menu as below. The OnSavePattern function follows after that.

    if(itemId==A1)
    {
        A2Dlg A3(this, wxID_ANY);
        if(A3.ShowModal()==wxID_OK)
        {
           A3.OnSavePattern();
           wxGetApp().getPattern()->var1=1;
        }
    }

    //////////////////////////////////////////

    void A2Dlg::OnSavePattern()
    {
        if(radioButtonYM->GetValue())
            wxGetApp().getPattern()->var2=1;
        else if(radioButtonY->GetValue())
            wxGetApp().getPattern()->var2=2;
        else if(radioButtonM->GetValue())
            wxGetApp().getPattern()->var2=3;
        Refresh();
    }

However, sometimes, the code does not call OnSavePattern on hitting Ok. I am not sure why this happens, and also I am not creating another instance of A2Dlg. Any help would be great. Please let me know if more explanation of the problem is needed.