Yes, there was one breaking change in 4.3 version line (Leafs -> Leaves). Sorry for inconvenience. But we decided not to create obsolete members, in order to make control cleaner, since property rename looks like painless.
There's changes.txt file in Program Files directory of the control.
We can create for you specific version (using source control system), but I believe that you can safely modify Leafs->Leaves and release your tested app.