Migrating from RadTreeView for ASP.NET to ASP.NET Ajax

[Vijay]

I have migrated to telerik asp.net ajajx controls. Below is the javascript code which was working fine for RadTreeView when I was using the older verison of telerik controls but it is not working anymore after migrating to ASP.NET ajax controls.

 
Below is the code when I was using older version of telerik controls.

function CheckAllLeafs()
    {
        var i;
        var lvlChk= document.getElementById("CheckAllLeafsDropDown").options[document.getElementById("CheckAllLeafsDropDown").selectedIndex].value;
        for (i=0; i<TopicsTree.all.length; i++){
         {
                if(TopicsTree.all[i].Level == lvlChk)
                {
                    TopicsTree.all[i].Check();
                }
                else
                {
                    TopicsTree.all[i].Check();              }
            }
        }
    }

After mograting to the ASP>NET Ajajx controls, I made the following changes

 

function CheckAllLeafs()
    {
        var i;
        var lvlChk= document.getElementById("CheckAllLeafsDropDown").options[document.getElementById("CheckAllLeafsDropDown").selectedIndex].value;
        for (i=0; i<TopicsTree.all.length; i++){
        if(TopicsTree.all[i].tagName == "INPUT") {
                if(TopicsTree.all[i].Level == lvlChk)
                {
                    TopicsTree.all[i].Checked = true;
                }
                else
                {
                    TopicsTree.all[i].Checked = false;
                }
            }
        }
    }

 

But it never executes statement 'TopicsTree.all[i].Level == lvlChk' since there is no property such as 'Level'. I could find the property for 'check' but can't find for 'Level'.

Plese help me!