combotree scrollTo not work

[patana]

I have a long list inside combotree.
when user open form for edit, for combotree, when user click on the combotree then i want it scroll to that node.
In my code:

Code:

var node = $('#mycombotree').combotree('tree').tree('find',250);  
$('#mycombotree').combotree('tree').tree('expandTo', node.target);     
$('#mycombotree').combotree('tree').tree('select', node.target);                 
$('#mycombotree').combotree('tree').tree('scrollTo', node.target); 

But it seems not scroll to that node.
Any solution?