I just did a quick test and the following exception was thrown - System.Exception: A form can't be both an MDI child and MDI parent. So, if it is possible, it isn't done in the most obvious way. Maybe there is a complicated workaround?

For this to work, first the treeview and then the splitter should be docked to the left. The editview should be set to DockStyle.Fill.

I've been trying to figure that out myself. I found this article http://codeproject.com/csharp/dockingcontrol.asp which demonstrates a docking control, not a standalone window though.

Can someone point me to some code for a C# grid control? Is it possible to use the datagrid for displaying an editable grid which is not loaded from a database? Why hasn't Microsoft included a grid control in VS.NET?