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If I create a line then attempt to change the opacity, the application crashes. Sometimes it doesn't happen on the first attempt, but on the second it does. This is when I touch and press on the screen to bring up the menu with the option, then hit Opacity. 

System.NullReferenceException: Object reference not set to an instance of an object.

   at Syncfusion.Windows.PdfViewer.PdfDocumentView.OpacityFlyoutItem_Click(Object sender, RoutedEventArgs e)

It seems to happen if you create a line, click on that line (this is using the touch screen and not a mouse) and then try to click and hold on it again. If the line isn't highlighted, but the menu comes up it will then crash on selection of Opacity. This might also be trye when clicking on the other ones as well, i've not tried those. It loosk like it loses focus of the line and then when you click on Opacity it is returning Null because it's we;re no longer highlighting that line.