To resolve this remove the MinWidth setting. You can set it back when the window is restored. private double myMinWidth; private void Window_WindowStateChanged(object sender, System.EventArgs e) { var window = (RadWindow)sender; if (window.WindowState == WindowState.Minimized) { this.myMinWidth = window.MinWidth; window.MinWidth = 0; } else { window.MinWidth = this.myMinWidth; } }