Unknown toolbox appears in Visual Studio

Question

I don't know the name of this window, and can't remove it. What it is called and how to remove it?

Answer 1

Those list the hidden/non-visual Component objects. Called the "Component Designer" , it is part of the Windows Form designer. You can't remove it.

Answer 2

似乎如果有人想删除它，唯一的方法是删除所有这些对象 - 但前提是您不需要这些对象。