Is there a way to create a custom control and have it appear in the IDE toolbox? If so, how do I do it? Is it documented anywhere?
At the very bottom of the Library (in a group called Project Controls, if you have group headings displayed) is a list of control subclasses from your project. This is an easy way to drag your own custom controls onto a layout. You can exclude controls from appearing in this section by using the HideFromLibrary attribute or by choosing "All Built-In Controls" from the drop-down at the top of the Library.