void Initialize()
        {
            Window window = NUIApplication.GetDefaultWindow();

            window.KeyEvent       += OnKeyEvent;
            window.BackgroundColor = Color.White;

            BtnClient = new Button()
            {
                Text     = "QuickPanelClient",
                Size     = new Size(400, 100),
                Position = new Position(100, 200),
                Margin   = 10,
            };

            BtnService = new Button()
            {
                Text     = "QuickPanelService",
                Size     = new Size(400, 100),
                Position = new Position(100, 400),
                Margin   = 10,
            };

            BtnSoftkeyClient = new Button()
            {
                Text     = "SoftkeyClient",
                Size     = new Size(400, 100),
                Position = new Position(100, 600),
                Margin   = 10,
            };

            BtnSoftkeyService = new Button()
            {
                Text     = "SoftkeyService",
                Size     = new Size(400, 100),
                Position = new Position(100, 800),
                Margin   = 10,
            };

            window.Add(BtnClient);
            window.Add(BtnService);
            window.Add(BtnSoftkeyClient);
            window.Add(BtnSoftkeyService);

            BtnClient.ClickEvent         += BtnClient_ClickEvent;
            BtnService.ClickEvent        += BtnService_ClickEvent;
            BtnSoftkeyClient.ClickEvent  += BtnSoftkeyClient_ClickEvent;
            BtnSoftkeyService.ClickEvent += BtnSoftkeyService_ClickEvent;

            tzShell = new Shell.TizenShell();

            window.AddAvailableOrientation(Window.WindowOrientation.Portrait);
            window.AddAvailableOrientation(Window.WindowOrientation.Landscape);
            window.AddAvailableOrientation(Window.WindowOrientation.PortraitInverse);
            window.AddAvailableOrientation(Window.WindowOrientation.LandscapeInverse);
        }