Hello, Luca,
Thank you for requesting this.
At this moment, you can set SvgImage to DocumenWindow as follows:
var tabStripElement = this.documentWindow1.DockTabStrip.SplitPanelElement.Children[2] as RadPageViewTabStripElement;
(tabStripElement.ItemContainer.ItemLayout.Children[0] as TabStripItem).SvgImage = RadSvgImage.FromFile(@"..//..//Riepilogo.svg");
Regards,
Nadya | Tech Support Engineer
Progress Telerik
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