VB.NET ListView scroll - rowheight not fixed

[Rakham]

Hi! I'm have been converting old VB6.0 project to VB.NET (2008) and now I'm struggling with ListView component. ListView Events are coming clearer now and I managed to read a huge amount of data (96.000 rows) from textfile to ListView with 6 subitems. All rows are build up nicely, but when I'm scrolling down the rows slowly, through scrollbar (clicking bottom arrow), rowheight is reduced to about half in first 20-30 rows below components upper row??? When I'm using PageDown or scrolling faster (dragging from scrollbar), everything is ok. And when I click to blurred row, it is refreshed and rowheight returns to normal. This didn't happen in VB6.0. Is there any Event, where I could use "lstView.Refresh()" or something to avoid this? Can't advise people to use PageDown only, when scrolling!!!