[mmrk]

Maybe works, i dunno

pawn Код:

CMD:buygun(playerid,params[])
{
    #pragma unused params
    ShowPlayerDialog(playerid,WEP_LIST,DIALOG_STYLE_LIST,"Weapons","Pistols\nAutomatic Weapons\nShotguns\nAssault\nSpecial","Select","Leave");
    return 1;
}

You should add this too if you haven't..

pawn Код:

public OnPlayerCommandPerformed(playerid, cmdtext[], success)
{

    if(!success) SendClientMessage(playerid,RED,"Server: Unknown command.");
    return 1;
}