Slider position should be same after reopening the slider

[Vivek]

Hi Team,

 I did the slider left right zoom in ,zoom out But now i am facing another problem, While clicking the slider button the slider is doing zoom in zoom out but when i close the slider and open once again then again the slider is open from the start , The slider should be start from the previous place where i left the slider and close it.

I want the solution for this how i will open the slider again for the same position where i left the slider .

Please help me

private void Zoom_slider_Click(object sender, RoutedEventArgs e)
        {

            RadWindow Zoom_slider_window = new RadWindow();
            Zoom_slider_window.Header = "Zoom Slider";
            Zoom_slider_window.Height = 100;
            Zoom_slider_window.Width = 300;
            Zoom_slider_window.WindowStartupLocation = Telerik.Windows.Controls.WindowStartupLocation.CenterOwner;
            Zoom_slider_window.ResizeMode = ResizeMode.NoResize;
            Pre_grid.Children.Add(Zoom_slider_window);
            Zoom_slider_window.Show();



            //Now add a slider to window
            Zoomslider = new RadSlider();
            Zoomslider.VerticalAlignment = System.Windows.VerticalAlignment.Center;
            Zoomslider.TickPlacement = TickPlacement.Both;
            Zoomslider.TickFrequency = 2;
            Zoomslider.HandlesVisibility = System.Windows.Visibility.Visible;
            Zoom_slider_window.Content = Zoomslider;
            Zoomslider.Maximum = 10;
            Zoomslider.Minimum = 1;
            Zoomslider.SmallChange = 0.3;

            if (Zoomslider.Value != null)
            {
                Zoomslider.SelectionStart = oldZoomValue;

            }
            Zoomslider.Value = 1;





            //Event handling
            Zoomslider.ValueChanged+=new RoutedPropertyChangedEventHandler<double>(Zoomslider_ValueChanged);



        }

        private static double oldZoomValue=0;

        private void Zoomslider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {


            if (Zoomslider.Value < oldZoomValue)
            {
                ZoomOut();
            }

            else
            {
                if (Zoomslider.Value > Zoomslider.Minimum)
                {


                    ZoomIn();

                }
            }
            oldZoomValue = Zoomslider.Value;
        }

e.

[Petar Mladenov]

Hi Vivek,

The RadWindow re-loads its content every time it has been clicked or has been shown. So if you place a new RadSlider in it the RadSlider will also be reloaded every time and its ValueChanged event will be fired with Value=0.
Could you please check this out by using a Debug breakpoint in the ValueChanged event. However, the solution you have made is more like a winforms than a Silverlight one. In Silverlight, you can take a full advantage of using ViewModels (MVVM design pattern) bound to your controls. These ViewModels could have properties that are two-way bound and will reflect the changes that you make in the UI.Could this fit in your case ?
Furthermore, you can examine this demos showing our new PersistenceFramework  ( which is part of Q2 2011 Beta Release) that could be used for saving the current state of a RadControl.
Please let us know if you need further assistance.

Greetings,
Petar Mladenov
the Telerik team