JDeveloper 10g Form design view error

I have a strange problem in JDeveloper 10g.

Some forms I can't see in View window, and therefore I can't select and edit properties in Poperty inspector, also in UI complete structure is missing. Forms without UI

Besides that form is working OK.

This one is OK.

enter image description here

How can I resolve this without the need for re-creation od forms?

Solution

Problem was resolved with this changes. I don't know yet what caused this form to be erroneously created.

    //JScrollPane scPane = new JScrollPane(dataPanel); //This was surplus
    //topPanel.add(scPane, BorderLayout.CENTER);    //This was surplus
    topPanel.add(dataPanel, BorderLayout.CENTER); //This was missing