CalendarsButton->Connect(wxEVT_COMMAND_BUTTON_CLICKED, wxCommandEventHandler(XCCalendarManipulator::ShowCalendarsList), NULL, this);
PreviousButton->Connect(wxEVT_COMMAND_BUTTON_CLICKED, wxCommandEventHandler(XCCalendarManipulator::PreviousMonth), NULL, this);
CalendarsButton->Connect(wxEVT_COMMAND_BUTTON_CLICKED, wxCommandEventHandler(XCCalendarManipulator::ShowCalendarsList), NULL, this);
PreviousButton->Connect(wxEVT_COMMAND_BUTTON_CLICKED, wxCommandEventHandler(XCCalendarManipulator::PreviousMonth), NULL, this);