I am sorry for the delay in getting back to you on this.
I've been informed that you already discussed the first problem during the demo session with Stoich. And he explained to you that in some cases you need to expand the node in order to load the elements contained in it into the DOM tree.
For the second problem I need to see how the edit button is implemented, so I can assist you in writing the code. Would it be possible to provide access to your application or point me to a publicly accessible application similar to yours?
Also, we just released Service Pack 2 yesterday. It includes a lot of improvements related to our Kendo UI control wrappers. You can download it from your Telerik account here: Public URL
the Telerik team