void onGeneralSettingsCommand(IUICommand command) { settingsPopup = setupSettings(settingsPopup); SettingsFlyout.StandardFlyout generalpane = new SettingsFlyout.StandardFlyout(); generalpane.Width = settingsWidth; generalpane.Height = windowBounds.Height; // Place the SettingsFlyout inside our Popup window. settingsPopup.Child = generalpane; // Let's define the location of our Popup. settingsPopup.SetValue(Canvas.LeftProperty, SettingsPane.Edge == SettingsEdgeLocation.Right ? (windowBounds.Width - settingsWidth) : 0); settingsPopup.SetValue(Canvas.TopProperty, 0); settingsPopup.IsOpen = true; }