Compiler results
this is my own creation made with the EZ-IDE (BCX-GUI conform)
dragdrop and redrawing on the treeview is working correct.
commctrl.h for Digital Mars must be updated before it can compile this demo
borland        ok 
mingw          ok
lcc32          ok
pellesc        ok
digital mars   ok (the outdated commctrl.h uses old style definitions) [NM_TREEVIEW instead NMTREEVIEW]
mcvc++ toolkit ok
openwatcom     ok