Hello Claude IMBERT,
Most of the current WinForms controls come with Vista themes. Those include: Buttons, RadMenu, RadGrid, RadTreeView, RadTabStrip, RadComboBox, Scrollbars, RadCalendar.
Very soon we will add Vista visual appearance to the rest of the controls. In case you are interested in a control which is not on the list above, please let us know and we will try to expedite its implementation for Q3 2007, due next month.
the Telerik team