I too am having the big tab problem. Mine are right triangles that take up the whole window. The tool window is being created programmatically without a container but what container would I put it in? My doc site hierarchy is: DockSite, WorkSpace,TabbedMdiHost, TabbedMdiContainer, DocuemntWindow. I didn’t use SplitContainer because I did not want to split anything. The Tool window that I create starts out floating. When I start dragging the tool window, the icon in middle of the center cluster is missing. I can only make it a document if I pick from the menu. When I put the tool-window-as-document in a separate tab group, the original document’s tab looks normal.
If sample code will help, please let me known.