Added references to wxTreeItemId::IsOk
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@18029 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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@@ -1,7 +1,8 @@
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\section{\class{wxTreeCtrl}}\label{wxtreectrl}
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A tree control presents information as a hierarchy, with items that may be expanded
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to show further items. Items in a tree control are referenced by wxTreeItemId handles.
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to show further items. Items in a tree control are referenced by wxTreeItemId handles,
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which may be tested for validity by calling wxTreeItemId::IsOk.
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To intercept events from a tree control, use the event table macros described in \helpref{wxTreeEvent}{wxtreeevent}.
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