The Flexible Layout (std_flex_layout) weblet's properties are:
addBackButton
backButtonSwatch
backButtonText
contentSwatch (deprecated)
footerFullscreenMode
footerPosition
footerSwatch
headerFullscreenMode
headerPosition
headerSwatch
pageSwatch
persistentFooterId
showFooter
showHeader
showMessages
sidebarPositionSmallScreen
useAjax
validationErrorDisplay
validationTime
windowTitle