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Access child in customized wxPanel
class MyPanel : public wxPanel
 {
       public:
          MyPanel(wxWindow* parent) : wxPanel(parent){}
          void OnMouseMove(wxMouseEvent& event);
       private:
          DECLAER_EVENT_TABLE()
  };

class mainFrame : public wxFrame
 {
       ...
       private:
          ...
          MyPanel* myPanel;
          ...
          wxStaticText* StaticText1;
          ...
 };

class mainFrame : public wxFrame
{
  friend class MyPanel;
  ...
};

class MyPanel : public wxPanel
  {
        public:
           MyPanel(wxWindow* parent) : wxPanel(parent){}
           void OnMouseMove(wxMouseEvent& event) { if (StaticText1) { /* do something */ } ;
           void SetStaticText1(wxStaticText* txt) { StaticText1 = txt;}
        private:
           DECLAER_EVENT_TABLE()
           wxStaticText* StaticText1;

   };