Slider usage with a Tree

[Swati Udas]

I am trying to have a Tree in an expanbarwidget. User should be able to scroll through the tree elements using a slider.
I wrote following code for the same

 final Tree  tree = new Tree(composite, SWT.SINGLE);
GridData gdTree = new GridData(SWT.LEFT,SWT.TOP,true,true);
gdTree.widthHint=450;
gdTree.heightHint=200;
tree.setLayoutData(gdTree);
for (int i = 1; i < 2; i++)
 {
   final TreeItem tritem1  =
    new TreeItem(tree,SWT.NULL);
   item1.setText("node "+i);
   for (int j = 1; j < 6; j++)
   {
     final TreeItem item11 = 
      new TreeItem(tritem1,SWT.NULL);
     item11.setText("node "+i+"."+j);
   }
 }
 
 slide.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
//       tree selection operations for tree in section 1
      Control[] children= [B][I]tree.getChildren();[/I][/B]               int count=children.length;
      int newSel=count*slide.getSelection()/100;
      tree.setSelection(tree.getItem(newSel));
      
      }
    });

Whlie debuggin I put a breakpoint inside slider-listener.
Message says- "tree" cannot be resolved.
However if I try this on a text box instead of tree everything works fine.
Any suggestions ?
Thanks for reading my question .

[Swati Udas]

Hi Its working now ..just shifted some code outside the listener.

<Control[] children= tree.getChildren(); int count=children.length;
int newSel=count*slide.getSelection()/100;>