[Nero_3D]

If the command didn't work with the zcmd layout why should it work with strcmp ?
Also I am not sure if you just misspelled it but it is Received

Firts of all remove the ColorsSTR array, it is useless

pawn Код:

CMD:colourlist(playerid, params[]) {
    new
        dstring[2000] // max 20 chars per line * 100 (sizeof Colors)
    ;
    for(new i; i < sizeof Colors; i++) {
        format(dstring, sizeof dstring, "%s\n{%x}Colour #%d", dstring, Colors[i] >> 8, i);
    }
    return ShowPlayerDialogEx(playerid, DIALOG_MESSAGE, DIALOG_STYLE_LIST, "Vehicle Colours", dstring[1], "Okay", "");
}