UITableViewCell with all subviews disappears

I placed UITableViewCel开发者_JAVA技巧l with UITextField as UITableView's tableHeaderView in Interace Builder. When I start editing text in UITextField, UITableViewCell with UITextField disappear. They even disappear when compiling this xib in Interface Builder. Any possible solutions?

---

First of all, it doesn't have to be inside table view cell. Try to use a regular UIView instead of the table view cell.

When exactly it disappears?
On keypad appearance or after typing the first char?