C++ & UI state machine

Still progressing slowly on the software, and had some problems with the development toolchain Avr-gcc/g++ as it does not support the full c++ syntax, especially new/del/ and virtual functions.
I spend some hours to write a first version in C-like, when someone from rcopensource list point me to this very interesting thread.

So, with this help, I rewrote the state machine of the UI in C++ language with virtual functions and new/del. It looks good, it should be easy to update and maintain. Here is an example of the code for one screen:

// --------------------------------------------- Servo Neutre
screenText OScrServoNeutre::text[LINE][LINE_LENGTH] = 
{ 
  /*01234567890123456789  */
  "# Servo Neutre &&&&>\0", 
  "<==Servo            \0", 
  "      valeur = &&&& \0", 
  "< -              + >\0" 
};
OScreen * OScrServoNeutre::Action(e_command cmd) 
{
  switch (cmd)
  {
    case swUpLeft: return (scrServo);
    case swUpRight: 
                   servo = IProcessor::ServoSelect(); 
                   return (scrServoNeutre);
    case swDownLeft: 
                   neutre = IProcessor::ServoNeutreDecr(); 
                   return (scrServoNeutre);
    case swDownRight: 
                   neutre =  IProcessor::ServoNeutreIncr() ; 
                   return (scrServoNeutre);
    default: return (scrError);
  }
}

void OScrServoNeutre::PostAction()
{
  SubVarText(); 
  Display();
}