internal void RefreshFlyoutPosition() { _paneRoot ??= _splitView.GetDescendantByName <FrameworkElement>("PaneRoot"); if (_paneRoot == null) { return; } _HCPaneBorder ??= _splitView.GetDescendantByName <WRectangle>("HCPaneBorder"); if (_paneRoot != null) { if (_height == -1) { _paneRoot.Height = double.NaN; _paneRoot.VerticalAlignment = Microsoft.UI.Xaml.VerticalAlignment.Stretch; if (_HCPaneBorder != null) { _HCPaneBorder.Visibility = Microsoft.UI.Xaml.Visibility.Visible; } } else { _paneRoot.Height = _height; _paneRoot.VerticalAlignment = Microsoft.UI.Xaml.VerticalAlignment.Top; if (_HCPaneBorder != null) { _HCPaneBorder.Visibility = Microsoft.UI.Xaml.Visibility.Collapsed; } } } }