I am having to test/update a legacy app written for Windows NT on
Windows 2000/XP. This app creates multiple child windows (not MDI) for
a parent window.
Each child window may contain various edit controls.

I have found two major incompatibilities, the child window title bar
is not highlighted. From various usenet postings it seems this is
designed Windows behaviour. Since the application handles all windows
messages and focus processing in its code, somehow this worked on NT.

Edit conrols are receiving focus through mouse clicks. But I am unable
to position the caret in the control using the mouse. I cannot also
select text by dragging the mouse. Double clicking works.

This application does a lot of nonstandard things but the same code
worked on NT. Does anyone know of any differences in
focus/selection/position processing in Win2K/XP from WinNT ?

All help appreciated.
Thanks