B4J Question [BANano] [SOLVED] Confused about the Final Map Order

Sub SetMonths
    Clear
    AddItem("01", "January")
    AddItem("02", "February")
    AddItem("03", "March")
    AddItem("04", "April")
    AddItem("05", "May")
    AddItem("06", "June")
    AddItem("07", "July")
    AddItem("08", "August")
    AddItem("09", "September")
    AddItem("10", "October")
    AddItem("11", "November")
    AddItem("12", "December")
End Sub

Sub SetMonths
    Clear
    Dim Months As SDUIMap = SDUIShared.Months
    Dim mItems As List = Months.Keys
    For Each k As String In mItems
        Dim v As String = Months.Get(k)
        AddItem(k, v)
    Next
End Sub

public Sub GetKeyAt(idx As Int) As Object
    Dim s As Int = getSize - 1
    If idx >= 0 And idx <= s Then
        Dim itemKey As Object = xlist.Get(idx)    
        Return itemKey
    Else
        Return Null
    End If
End Sub

public Sub GetValueAt(idx As Int) As Object
    Dim s As Int = getSize - 1
    If idx >= 0 And idx <= s Then
        Dim itemKey As Object = xlist.Get(idx)
        Dim item As Object = xmap.Get(itemKey)
        Return item
    Else
        Return Null
    End If
End Sub