I would like to change Expanded property without showing/hiding connected nodes.
Maby you could add method for this?

Please take a look whether this version will do the job:

https://mindfusion.org/_beta/fcnet41beta.zip

It provides a Node.SetExpandeFlag(bool) method and a FlowChart.PrintPreview(Form) method. Your custom preview dialog must inherit from Form and implement the IPrintPreview interface defined by Flowchart.NET. There is only one property in that interface:

System.Drawing.Printing.PrintDocument Document {get; set; }

same as the property of the .NET PrintPreviewControl which you will probably host in your form.

Stoyan

This will be available in the .NET 2 assemblies too, but we haven't ported it there yet. We will release it with the public beta version in a couple of days.