I saw your nice accordion. Where is sample code for the small example? I saw some code on stackoverflow, but nothing shows up in my form. I use VS 2017, and .Net 4.5.
Make sure you are adding the Accordion object to the form, (e.g. form.Controls .Add(accordion);) and make sure the accordion DockStyle is set to fill (accordion.Dock = DockStyle.Fill;).
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Make sure you are adding the Accordion object to the form, (e.g. form.Controls .Add(accordion);) and make sure the accordion DockStyle is set to fill (accordion.Dock = DockStyle.Fill;).