How do I make my custom dialog droppable in the design surface like a component?

I read this in Windows Forms FAQ and made as described. But when I rebuild my project custom dialog name was changed into class name of custom dialog. Like this: // I have some UserControl class [Designer(typeof(ComponentDesigner))] class MyControl : UserControl { ... } When I place it to my form I recieve some myControl1 variable but after rebuild I recieve new variable MyControl and old variable become unassigned. P.S. Sorry for my English ;)