Something

public OnGameModeInit()
{
	Menu1 = CreateMenu("Menu1", 1, XX, XX, XX, XX);
	if (IsValidMenu(Menu1)){
		SetMenuColumnHeader(Menu1, 0, "Menu");
		AddMenuItem(Menu1, 0, "Pistolas");
	}

	Menu2 = CreateMenu("Menu2 ", 2, XX, XX, XX, XX);
	if (IsValidMenu(Menu2 )){
		SetMenuColumnHeader(Menu2 , 0, "weapons");
		SetMenuColumnHeader(Menu2 , 1, "price");
		AddMenuItem(Menu2 , 0, "XXXXXX");
		AddMenuItem(Menu2 , 1, "$XX");
	}
return 1;
}

public OnPlayerSelectedMenuRow(playerid, row)
{
	if(GetPlayerMenu(playerid) == Menu1) {
		switch(row) {
			case 0: {
				ShowMenuForPlayer(Menu2, playerid);
			}
		}
	}
	if(GetPlayerMenu(playerid) == Menu2) {
		switch(row) {
			case 0: {
			    GivePlayerWeapon(playerid, XX, XXX);
			    GivePlayerMoney(playerid, XX);
			    ShowMenuForPlayer(Menu2, playerid);
			}
		}
	}
}