-\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.}