#include < amxmodx >

new g_hMenu;

public plugin_init( ) {
    register_plugin( "Menu", "1.0", "XY" );

    new hCallback = menu_makecallback( "MenuCallback" );

    register_clcmd( "say /menu","ShowMenu");

    g_hMenu = menu_create( "Some Menu", "MenuHandler" );
   
    menu_additem( g_hMenu, "You can press me", "1" );
    menu_additem( g_hMenu, "You can't press me", "2", _, hCallback );
    menu_additem( g_hMenu, "You can press me, too", "3" );
}

ShowMenu( client ) {
    menu_display( client, g_hMenu );
}

public MenuCallback( client, hMenu, iItem ) {
    // iItem starts at 0
    if( iItem == 1 ) {
        return ITEM_DISABLED;
    }
   
    return ITEM_ENABLED;
}

public MenuHandler( client, hMenu, iItem ) {
    if( iItem == MENU_EXIT ) {
        return;
    }
   
    switch( iItem ) {
        case 0: {
            client_print( client, print_chat, "You chose option #1" );
        }
        case 2: {
            client_print( client, print_chat, "You chose option #3" );
        }
    }
   
    ShowMenu( client );
}