27.5 Event Handling

• We will now attach actions to the menu items.
• Define a function for each action.

  void EventFrame::OnSayHello(wxCommandEvent& event)
  
  {
     text->AppendText("Hello, World!\n");
  } 

• We want this function to run whenever the program user selects the menu option.
• All event handler functions have a parameter that describes the triggering event.
• You must declare the function this way or get a bewildering error message (note that the parameter is not used in the function).

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