Hello Raj A R,
Unfortunately, we do not have Center method that will force RadWindow to rearrange its position. However, you can easily calculate the center location of the screen and subtract the width and the height of the window to get the proper center location. For example, if your application is already loaded and your RadWindow is arranged, as in your case, you can use this code snippet:
Size appSize = Application.Current.RootVisual.RenderSize;
window.Left = Math.Round((appSize.Width / 2) - (window.ActualHeight / 2), 0);
window.Top = Math.Round((appSize.Height / 2) - (window.ActualHeight / 2), 0);
Note that the ActualHeight and ActualWidth are only valid if the control is already shown and thus arranged. The rounding is required in order to make sure your window will appear on exact pixels, and thus won't look blurred.
If you have any other questions, feel free to contact us as soon as possible.
the Telerik team