/// <summary>
        /// Connect to Oracle
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void ConnectToOracle_OnExecuted(object sender, ExecutedRoutedEventArgs e)
        {
            await DiagramFacade.CloseDiagramsOnDisconnect(this);

            SessionProvider.Instance.Disconnect();
            DatabaseConnectionSidebar.HideDatabaseStackPanels();

            ProgressDialogController progressDialogController = null;

            Func <ProgressDialogController, Task> closeProgress = async t =>
            {
                if (t != null)
                {
                    if (t.IsOpen)
                    {
                        await t.CloseAsync();
                    }
                }
            };

            try
            {
                progressDialogController = await this.ShowProgressAsync("Please wait", "Connecting to server...", false, new MetroDialogSettings()
                {
                    AnimateShow = false,
                    AnimateHide = false
                });

                progressDialogController.SetIndeterminate();

                var db = new OracleDatabase();
                await db.BuildSession(OracleServerNameTextBox.Text, OraclePortTextBox.Text, OracleSidTextBox.Text,
                                      OracleUsernameTextBox.Text, OraclePasswordBox.Password);

                //Init work
                await Task.Factory.StartNew(() =>
                {
                    using (IOracleMapper mapper = new OracleMapper())
                    {
                        TableModel model = mapper.ListTables().FirstOrDefault();
                        if (model != null)
                        {
                            mapper.ListForeignKeys(model.Title);
                        }
                    }
                });

                await closeProgress(progressDialogController);

                await this.ShowMessageAsync("Connected", $"Successfuly connected to {SessionProvider.Instance.ServerName}");

                var flyout = Flyouts.Items[2] as Flyout;

                if (flyout != null)
                {
                    flyout.IsOpen = !flyout.IsOpen;
                }

                await DatabaseConnectionSidebar.LoadOracleData();
            }
            catch (OracleException exception)
            {
                await closeProgress(progressDialogController);

                await this.ShowMessageAsync("Connection error", exception.Message);

                Output.WriteLine(OutputPanelListener.PrepareException(exception.Message));
                SessionProvider.Instance.ConnectionType = ConnectionType.None;
            }
        }