Zdarzenie po wybraniu opcji w ComboBox

switch( message )
{
case WM_COMMAND:
   
    if( HIWORD( wParam ) == CBN_SELCHANGE )
    // If the user makes a selection from the list:
    //   Send CB_GETCURSEL message to get the index of the selected list item.
    //   Send CB_GETLBTEXT message to get the item.
    //   Display the item in a messagebox.
    {
        int ItemIndex = SendMessage(( HWND ) lParam,( UINT ) CB_GETCURSEL,
        ( WPARAM ) 0,( LPARAM ) 0 );
        TCHAR ListItem[ 256 ];
        ( TCHAR ) SendMessage(( HWND ) lParam,( UINT ) CB_GETLBTEXT,
        ( WPARAM ) ItemIndex,( LPARAM ) ListItem );
        MessageBox( hwnd,( LPCWSTR ) ListItem, TEXT( "Item Selected" ), MB_OK );
    }
   
    wasHandled = true;
    result = 0;
    break;