Problems with custom control

Question

Hi everyone, I'm here asking some help:

I'm doing a very huge project with compact framework...and...thinking in give manutence in future, I realy need to program it in a good OO...and...the first problem is: I created custom class of TextBox, ComboBox, and others controls, with some propers changed for my default, like background in Gray, but, when I put there in the form, the IDE can't render in a TextBox, for exemple, showing the name of the class.

Creating this same thing in other smartdevice project, my code works, but in this one, something makes it don't...

since now I appreciate the help =)