* \var{level} & (integer) Stacking level; default is 1. \\
* \var{modal} & (boolean) Make object modal; ignored if level is set. \\
* \var{sizepolicy} & (string) Size policy; see Section \ref{sec:sizepolicies}. \\
+ * \var{bottom} & (boolean) Mark the attached region as the
+ * ``bottom'' of \var{ws}. \\
* \end{tabularx}
*
* In addition parameters to the region to be created are passed in this