public object Owner { get; }

Public ReadOnly Property Owner As Object

public Form1() {
    InitializeComponent();
    DXAccessible.QueryAccessibleInfo += DXAccessible_QueryAccessibleInfo;
}

private void DXAccessible_QueryAccessibleInfo(object sender, DXAccessible.QueryAccessibleInfoEventArgs e) {
    if (e.Role == AccessibleRole.ListItem && e.OwnerControl == tileControl1) {
        TileItem item = e.Owner as TileItem;
        if (item != null && item.Elements.Count > 1) {
            e.Name = item.Elements[0].Text;
            e.Description = item.Elements[1].Text;
        }
    }
}

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    AddHandler DXAccessible.QueryAccessibleInfo, AddressOf DXAccessible_QueryAccessibleInfo
End Sub

Private Sub DXAccessible_QueryAccessibleInfo(sender As Object, e As DXAccessible.QueryAccessibleInfoEventArgs)
    If e.Role = AccessibleRole.ListItem AndAlso e.OwnerControl Is TileControl1 Then
        Dim item As TileItem = TryCast(e.Owner, TileItem)
        If item IsNot Nothing AndAlso item.Elements.Count > 1 Then
            e.Name = item.Elements(0).Text
            e.Description = item.Elements(1).Text
        End If
    End If
End Sub