ADD: Functionality in TreeList to Sorting with Subobjects like this:

<telerik:TreeListBoundColumn DataField="subobject.MyPropertyName" SortExpression="subobject.MyPropertyName"
 HeaderText="MyPropertyName" UniqueName="MyPropertyName"  >
        

When using LoadOnDemand in a RadTreeList, it would be great to have it automatically expand to a selected item when initially loading on a page.

This functionality would aggregate a lot of value to the RadTreeList.  I will explain you why it is important. In order to prepare the information to give it to the TreeList, it is necessary to make a lot of hierarchical calculations that consume a lot of CPU and memory resources.  It causes that any server could be busy doing the same complex calculations with each click expanding any level. If you have a lot of users that expands a node of the tree, the server could crash. I prefer,  RadTreeList had all the information one time to prevent making unnecessary recalcularions with every click. 

I like Telerik components, but this issue make me to search another tree component in the market.  Please reconsider this functionality in your next version of your RadTreeList.

RadTreeList control dose not support RTL format, please add this feature.

check attachement.

Your RadTreeList for ASP.NET AJAX is an amazing product but we would love to see more of the grid functionality implemented in it.

Two very notable features from the RadGrid we would like to have in the RadTreeList are the "EnableHeaderContextMenu" so that we can hide and show columns on-demand and also column filtering capability.

Please think about including these in future releases.

Thanks,
Curtis

Currently there is no client side API to bind data from client side. Please add this feature.

Allow client side expand/collapse for RadTreeList

We use the TreeList control in our ASP .NET 4, C# application (running on Internet Explorer). 
In a page we have a Repeater of Update Panels. Each Update Panel contains a TreeList. All TreeLists have the same behaviour. They have multiple sorting enabled, and by default they are sorted by 2 columns (Class, ID). When sorting by some other column (Example: State), we adjust the Sorting Expressions from (Class, ID, State) to (State, ID). The sorting icon is not visible on the State column, but we have a simple button with no text on the Class column.