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Because the DocumentTabStrip is hidden when a document is added, a layout pass is not triggered and that is why the panel is not positioned properly. What you can do is after displaying RadDock to explicitly perform such layout pass:
sender, EventArgs e)
DocumentWindow doc =
Panel p =
p.BorderStyle = BorderStyle.FixedSingle;
p.Dock = DockStyle.Fill;
p.Parent = doc;
This will ensure that the layout is performed as needed.
I hope this helps. Do not hesitate to contact us if you have other questions.
the Telerik team