noctis0430

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Inspired by @philc71 's solution, I've manage to write another variant of behavior which uses `CollectionChanged` event of the observable collection to observe the ribbon tab items in the ViewModel....

It is possible to create a new pdf file with some pages of the file, by deleting pages that are not desired. ``` C# var foo = PdfDocument.Load("pdf_sample.pdf"); // 0-based....