LAB13 การเพิ่ม Combobox ใน Dialog based Application

void CLABBBBBBBB13Dlg::OnCbnSelchangeCombo1()
{
CString str;
int idx = m_comboBox1.GetCurSel();
if( idx < 0 )
return;
m_comboBox1.GetLBText( idx, str );
m_staticDestination.SetWindowText(str);
}

void CLABBBBBBBB13Dlg::OnBnClickedButtonAdd()
{

CString srcText;
m_editSource.GetWindowText(srcText);
m_comboBox1.AddString(srcText);

}