First, the handler supersedes the HScroll and the VScroll properties of a ::com::sun::star::awt::UnoControlEditModel
and puts them into one common property, allowing the user to choose whether she want to
have "no", a "vertical", a "horizontal", or "both" scrollbars.
Second, if it detects a ::com::sun::star::form::component::RichTextControl to inspect,
it supersedes the ::com::sun::star::form::component::RichTextControl::RichText
and the ::com::sun::star::awt::UnoControlEditModel::MultiLine properties with a new
one which allows choosing the text type with one single action.