JTree Display keeps Repainting and Missing Information

I have a JTree that has objects for each node. When I try to send regular Text in the toString of the object, I have no issues with the display of the Tree. When I send HTML, the screen has issues with the repaint?? I expand the Tree and some of the rows are missing.. Anyone had this experience before.
public String toString() {
String Display = "<html><body><table border=\"0\" cellspacing=\"0\" cellpadding=\"0\"><tr><td width=\"160\">"+category+"</td><td width=\""+(MaxWidths[1]*6)+"\">"+problem+"</td><td width=\""+(MaxWidths[2]*6)+"\">"+goal+"</td><td width=\""+(MaxWidths[3]*6)+"\">"+parameter+"</td></tr></table></body></html>";
return(Display);
I am using tables to format the width of the columns. Does someone else use a different formating method?

1. set the height of rows to a value of less than or equal 0 so that the renderer is used to determine the rowheight of each row (note that for rendering purposes the tree is mapped on rows. Use
JTree.setRowHeight(0);for setting the row height.)
2. ensure that the renderer calculates the height of each cell correctly. I think you shouldn't have to when using JLabel or subclasses as renderers...
Regards,
Fritz

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