[Jochemd]

pawn Код:

CMD:radio(playerid, params[])
{
    if(IsPlayerInAnyVehicle(playerid)) ShowPlayerDialog(playerid, CARRADIO, DIALOG_STYLE_LIST, "Car Radio","Radio On\nRadio Off\nSet Station\nRadio Volume", "Select", "Cancel");
    else SendClientMessage(playerid, WHITE, "[SERVER]: {E5FA05}You are not in a car.");
    return 1;
}

This should work