Use the attached project to reproduce. Workaround: private void RadForm1_SizeChanged(object sender, EventArgs e) { toolWindow1.EnsureVisible(); }
Thank you for your input Mieke.
Global solution, addhandler to the Form_Sizechange -> And use this : For Each Obj As Telerik.WinControls.UI.Docking.DockWindow In Sender.RadDock1.DockWindows Obj.EnsureVisible() Next