\twocolwidtha{5cm}
\begin{twocollist}\itemsep=0pt
-\twocolitem{\windowstyle{wxNB\_LEFT}}{Place tabs on the left side.}
-\twocolitem{\windowstyle{wxNB\_RIGHT}}{Place tabs on the right side.}
-\twocolitem{\windowstyle{wxNB\_BOTTOM}}{Place tabs under instead of above the notebook pages.}
+\twocolitem{\windowstyle{wxNB\_LEFT}}{Place tabs on the left side. Not supported under Windows XP.}
+\twocolitem{\windowstyle{wxNB\_RIGHT}}{Place tabs on the right side. Not supported under Windows XP.}
+\twocolitem{\windowstyle{wxNB\_BOTTOM}}{Place tabs under instead of above the notebook pages. Not supported under Windows XP.}
\twocolitem{\windowstyle{wxNB\_FIXEDWIDTH}}{(Windows only) All tabs will have same width.}
\twocolitem{\windowstyle{wxNB\_MULTILINE}}{(Windows only) There can be several rows of tabs.}