+\twocolwidtha{5cm}
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\windowstyle{wxRB\_GROUP}}{Marks the beginning of a new group of radio buttons.}
+\twocolitem{\windowstyle{wxRB\_SINGLE}}{If your radio buttons are not
+consecutive siblings, they cannot form a group under Windows and you should use
+this style to indicate that each of them is handled individually.}
+\end{twocollist}