Hi Pan hal,
The project is in VB as requested, but is build with VS 2010. Which version of Silverlight and VS you are using?
However, the essential part of the project is in these rows of the MainPage.xaml.vb
window.WindowStartupLocation = Telerik.Windows.Controls.WindowStartupLocation.CenterOwner
window.Left = Application.Current.Host.Content.ActualWidth / 2 - window.ActualWidth / 2
window.Top = Application.Current.Host.Content.ActualHeight / 2 - window.ActualHeight / 2
Hope this helps.
If you need further assistance please let us know.
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