Whidbey SmartDevice WinForm designer has much better support for adding your custom control to the toolbox. Unlike Everret (Visual Studio 2003) that requires developer to create a design time assembly in addition to the runtime assembly, in Whidbey we eliminated the need for design time assembly completely.

Add your custom control type to the toolbox? There are 2 ways:

1. Simply build your project that contains UserControl, custom component or custom control. It will show up in the toolbox automatically and ready to be dropped to the designer.

2. From toolbox window, select "Choose Items" and browse to the assembly containing the custom control. After clicking OK, the types from the assembly you choose will be added to the toolbox.

Note controls / components compiled against .Net Compact Framework v1.0 will only show up in projects targetting .Net Compact Framework v1.0. Controls / components compiled against .Net Compact Framework v2.0 will only show up for projects targeting .net Compact Framework v2.0.