resource about .net FormDesigner

Custom Forms Designer: Toolbox and ToolboxService - Part 1

http://geekswithblogs.net/mtreadwell/archive/2007/10/25/116359.aspx

http://www.codeproject.com/KB/miscctrl/IPToolbox.aspx

Create And Host Custom Designers With The .NET Framework 2.0
http://msdn.microsoft.com/zh-cn/magazine/cc163634(en-us).aspx

http://social.msdn.microsoft.com/Forums/en-US/windowsworkflowfoundation/thread/75ae7d2e-4b2d-4979-8da6-06323a1f7907

http://www.cnblogs.com/panjiwen/category/36995.html