B4J Question [ABMaterial] TopItemWithSideBar is not visible on mobiles

Sub ConnectNavigationBar(page As ABMPage) 'ignore   
    ' Clear the dummies we created in BuildNavigationBar
    page.NavigationBar.Clear
    
        'lang switch
    page.NavigationBar.AddTopItem("lang", "{NBSP}{NBSP}{NBSP}", "mdi-action-language", "", True)
    For i = 0 To others.langs.Length - 1
        Dim t As String = others.langs(i).ToUpperCase
        page.NavigationBar.AddTopSubItem("lang", "lang_" & t, t, "", "")
    Next
    
    
    'where others.langs:
    Dim langs() As String = Array As String("RU", "EN", "ES")