_hours = new wxTextCtrl (this, wxID_ANY, wxT(""), wxDefaultPosition, size, 0, validator);
_hours->SetMaxLength (2);
sizer->Add (_hours);
_hours = new wxTextCtrl (this, wxID_ANY, wxT(""), wxDefaultPosition, size, 0, validator);
_hours->SetMaxLength (2);
sizer->Add (_hours);