JEditorPane (html page) doesn't appear on main frame

[EntryTeam]

class Browser has method getBrowserWindow() which returns JEditorPane(new URL("some URL")).

class MainForm calls new Browser().getBrowserWindow() and assigns it to another JEditorPane object.

editor = new Browser().getBrowserWindow(); 
scrollpane = new JScrollPane(editor);

Object editor.hashCode() is correct, so there's no doubt that i've got the right object.

Still, i can't see html page in the main frame.

P.S. i've tried creating instead of htmlpane simple JEditorPane filled with text only,
and this one i couldn't see neither.