Render all Thumbnails in Thumbnail panel

Hello. I created new thumbnails panel (factoryClone.buildThumbsPanel()) and some rewritten code of AbstractPageViewComponent.java for panel with thumnails in a JFrame. I powered graphic quality of thumbnails. But when i open for the first time my panel, not all pages are rendering. Not rendering pages in out of scope of JScrollPane. If Frame is big then all pages are rendering fully at the fitst time. How can i render all pages for any jframe size on start visibling frame?