Try to put in a command handler
Revert "Try to put in a command handler"

It's not really going to build, since the LeashView header needs
the afx headers for their types, and those include things that
can't be mixed with "regular" windows headers/applications.
This reverts commit 10c583144607831578cbda9bfdd5c18b4939e445.
Try again
Send a message to a different window
hacky crash avoidance

We'll need a real fix at some point.
Have the CommandHandler hold onto its HWND

That window makes a useful target to which to pass messages.
Send messages for inter-class communication
Remove ill-advised non-api code