More improvements to the Mac OS X TextField.Invalid() popover.
Resolved a TODO.
Removed wParam from handle() in table_Windows.c as it appears neitehr Control nor Shift affect checkboxes in Windows.
Checked refuses first responder status of all Controls on Mac OS X; everything's fine by default.
Verified NSImageView properties in the Mac OS X warning popover.
Tested beep in Mac OS X TextField.Invalid(); works.
Improved control transparency on Windows.
Fixed up Area on Windows to always draw the background regardless of the size of the clipping rectangle on the Go side and to not send extraneous WM_ERASEBKGND. This will be needed for having Areas draw the background.
Made Groups on Windows control parents.
Added empty Group test.
More TODOs.
More TODOs.
Removed merged back file.