The DataTree (sample ID 1OD0TXS) will not run and the Form1 (startup object) can not be opened in the designer. I had used this code as a basis for a data tree in an application developed using VS 2003 but since moving to 2005 it is not usable. I came back and re-downloaded the sample and it has the same problem that my modified code has.
I do hope that someone fixes it. This was a very useful piece of code.