make the second parameter to wxTreeCtrl.GetFirstChild optional
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15813 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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@@ -1213,7 +1213,7 @@ public:
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size_t GetChildrenCount(const wxTreeItemId& item, bool recursively = TRUE);
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wxTreeItemId GetFirstChild(const wxTreeItemId& item, long& INOUT);
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wxTreeItemId GetFirstChild(const wxTreeItemId& item, long& INOUT=0);
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wxTreeItemId GetNextChild(const wxTreeItemId& item, long& INOUT);
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wxTreeItemId GetNextSibling(const wxTreeItemId& item);
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wxTreeItemId GetPrevSibling(const wxTreeItemId& item);
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