There are third-party controls you can use to provide this effect. Here are a few:
>how to create mdi child dockable forms like those in IDE.
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Cathi Gero, CPA
Prenia Software & Consulting Services
Microsoft C# / .NET MVP
Mere Mortals for .NET MVP
cgero@prenia.comwww.prenia.comWeblog: blogs.prenia.com/cathi