[Unte99]

For now, you can use this.

pawn Код:

case 13:
{
    ShowPlayerDialog(playerid, DUELDIAG+6, DIALOG_STYLE_LIST, "Choose a weapon", "Brass Knuckles\nGolf Club\nNite Stick\nKnife\nBaseball Bat\nShovel\nPool Cue\nKatana\nChainsaw\nDildo\nVibrator\nFlowers\nCane\nGrenade\nTeargas\nMolotov\nColt 45\nSilenced Pistol\nDeagle\nShotgun\nSawn-Off\nSpas\nUzi\nMP5\nAK47\nM4\nTec9\nRifle\nSniper", "Select", "Back");
    return SendClientMessage(playerid, WHITE, "{FF0000}>> This weapon is disabled!");
}
case 14:
{
    ShowPlayerDialog(playerid, DUELDIAG+6, DIALOG_STYLE_LIST, "Choose a weapon", "Brass Knuckles\nGolf Club\nNite Stick\nKnife\nBaseball Bat\nShovel\nPool Cue\nKatana\nChainsaw\nDildo\nVibrator\nFlowers\nCane\nGrenade\nTeargas\nMolotov\nColt 45\nSilenced Pistol\nDeagle\nShotgun\nSawn-Off\nSpas\nUzi\nMP5\nAK47\nM4\nTec9\nRifle\nSniper", "Select", "Back");
    return SendClientMessage(playerid, WHITE, "{FF0000}>> This weapon is disabled!");
}
case 15:
{
    ShowPlayerDialog(playerid, DUELDIAG+6, DIALOG_STYLE_LIST, "Choose a weapon", "Brass Knuckles\nGolf Club\nNite Stick\nKnife\nBaseball Bat\nShovel\nPool Cue\nKatana\nChainsaw\nDildo\nVibrator\nFlowers\nCane\nGrenade\nTeargas\nMolotov\nColt 45\nSilenced Pistol\nDeagle\nShotgun\nSawn-Off\nSpas\nUzi\nMP5\nAK47\nM4\nTec9\nRifle\nSniper", "Select", "Back");
    return SendClientMessage(playerid, WHITE, "{FF0000}>> This weapon is disabled!");
}

Don't know if this works, but you can try it.

pawn Код:

case 13||14||15:
{
    ShowPlayerDialog(playerid, DUELDIAG+6, DIALOG_STYLE_LIST, "Choose a weapon", "Brass Knuckles\nGolf Club\nNite Stick\nKnife\nBaseball Bat\nShovel\nPool Cue\nKatana\nChainsaw\nDildo\nVibrator\nFlowers\nCane\nGrenade\nTeargas\nMolotov\nColt 45\nSilenced Pistol\nDeagle\nShotgun\nSawn-Off\nSpas\nUzi\nMP5\nAK47\nM4\nTec9\nRifle\nSniper", "Select", "Back");
    return SendClientMessage(playerid, WHITE, "{FF0000}>> This weapon is disabled!");
}