[DobbysGamertag]

pawn Код:

public OnPlayerEnterCheckpoint(playerid)
{                                                                  
    ShowPlayerDialog(playerid, the dialog id here, DIALOG_STYLE_LIST, "titlehere", "whatever you want in your menu", "button 1", "button 2");
    return 1; // not knowing what menu you want to pop up. I cant help you much
}