Hi ,

My Problem:
When a tree item/row is expanded , the scrollbars of the tree
automatically move to ensure that the child of the tree item (which is
expanded) is visible.
I donot want the scrollbars to move when tree is expanded.  Is there
any way we can do it without extending/inheriting
javax.swing.plaf.basic.BasicTreeUI?

I use:
- Java Swing's MetalTreeUI and my own tree class derived from JTree.

This behaviour seems to be controlled by
BasicTreeUI.toggleExpandedState

/**
    * Expands path if it is not expanded, or collapses row if it is
expanded.
    * If expanding a path and JTree scrolls on expand,
ensureRowsAreVisible
    * is invoked to scroll as many of the children to visible as
possible
    * (tries to scroll to last visible descendant of path).
    */
   protected void toggleExpandState(TreePath path) {
    if(!tree.isExpanded(path)) {
       int       row = getRowForPath(tree, path);

       tree.expandPath(path);
       updateSize();
       if(row != -1) {
        if(tree.getScrollsOnExpand())
           ensureRowsAreVisible(row, row + treeState.
                    getVisibleChildCount(path));
        else
           ensureRowsAreVisible(row, row);
       }
    }
    else {
       tree.collapsePath(path);
       updateSize();
    }
   }

Thanks
Naimish Parikh