options = flags
Currently the only flag valid for use with windows is:
This flag is used with tab control windows only. If it is not set, the tabs of the tab control’s child windows inherit the background colour of the child window. If OPT_NOCOLOURED is set, the default background colour is used for all child window tabs. This makes it possible to have a set of tab windows, each with a different background colour, but whose tabs share a common colour.