issues regarding treeview

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ASP.NET

I am Using tree view control of asp.net
there are 2 problems:

1) using table to place tree view and when I expand it the tree view goes down I want to fixed the height if tree view grows so it should grow in specific td or area and there should be scroll bar to go down. I need to handle this else it pushes whole page down and my save button also goes down because of if I fixed the area or td of tree view so it will grow up in its particular region and rest of layout remain on it place

2)There are Check-boxes in tree view in this hierarchy
Grand Father -->Father -->Child
All with check boxes.
When user click on check box with the help of JavaScript I use onclick to use _dopostback to use "check change event of tree view" to do some functionality. Problem is How can use Update Panel properly as we use ...


This function Onclick onntreeview

function postBackByObject()
{
    var o = window.event.srcElement;
    if (o.tagName == "INPUT" && o.type == "checkbox")
    {
       __doPostBack("","");
    }
}

Need Help Because Deadline Of Project Coming Close