This has a sizable border (Minimize, maximize) and you are able to use
all available buttons.
This has a non-sizable border which has only a Close button on it.
bsSingle
This has a non-sizable border and all buttons are available.
bsToolWindow
This has a non-sizable border with a small caption bar and only the
Close button is available.
bsSizeToolWin
This has a small caption bar with a sizable border and only the Close
button is
available.
bsNone
This has no border, is non-sizable and no buttons at all.