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?