[CaRa]

Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
   if (strcmp("/drink", cmdtext, true, 10) == 0)
   {
         ShowPlayerDialog(playerid, 1, DIALOG_STYLE_LIST, "What is it that you want?", "Pepsi cola ($1)\nCoke ($2)\nBeer($3)", "Purchase", "Cancel");
         return 1;
   }
   return 1;
}

Now it should work.