I noticed a strange bug in designer. Bug hides controls from my form. I
tried this with C# and VB Express Editions and both the result was the same.

Here is description how to see this bug:

1. Create Windows Application solution
2. Add user control to this solution, just create the control
3. Build solution in order to see UserControl in toolbox
4. Add a Tabcontrol into form
5. Select Tabpage 2
6. Insert a Groupbox into page 2 and place a button inside the group box.
7. Insert the user control somewhere into form.
8. Run the application
9. Close the application and return to IDE
10. Select Tabpage2 and you'll see that the button has disappeared!

Does anybody know what causes this? If you want to see that button again you
have to close the form and open it again. This very annoying...

The user control is essential in this problem, I'm sure that it causes all
this.

-Teemu