In the earliest versions of Silverlight the System.Windows.Controls.SelectionMode was not complete and since we share the same functionality and code as much as possible for Silverlight and WPF, we've created Telerik.Windows.Controls.SelectionMode in order to make them consistent. That is why, currently some of RadControls for SIlverlight are using Telerik.Windows.Controls.SelectionMode, this includes RadListBox, RadTreeView. etc. At this stage we cannot alter it as this will cause a breaking change which is something we're always trying to avoid.
I am sorry for any inconvenience caused.
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