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diff --git a/iup/src/iup_childtree.h b/iup/src/iup_childtree.h
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+++ b/iup/src/iup_childtree.h
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+/** \file
+ * \brief Control Hierarchy Tree management.
+ *
+ * See Copyright Notice in "iup.h"
+ */
+ 
+#ifndef __IUP_CHILDTREE_H 
+#define __IUP_CHILDTREE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \defgroup childtree Child Tree Utilities
+ * \par
+ * Some native containers have an internal native child that 
+ * will be the actual container of the children. This native container is 
+ * returned by \ref iupClassObjectGetInnerNativeContainerHandle.
+ * \par
+ * Some native elements need an extra parent, the ih->handle points to the main element itself, 
+ * NOT to the extra parent. This extra parent is stored as "_IUP_EXTRAPARENT".
+ * \par
+ * See \ref iup_childtree.h
+ * \ingroup object */
+
+/** Returns the native parent. It simply excludes containers that are from IUP_TYPEVOID classes.
+ * \ingroup childtree */
+Ihandle* iupChildTreeGetNativeParent(Ihandle* ih);
+
+/** Returns the native parent handle. Uses \ref iupChildTreeGetNativeParent and \ref iupClassObjectGetInnerNativeContainerHandle.
+ * \ingroup childtree */
+InativeHandle* iupChildTreeGetNativeParentHandle(Ihandle* ih);
+
+/** Adds the child directly to the parent tree.
+ * \ingroup childtree */
+void iupChildTreeAppend(Ihandle* parent, Ihandle* child);
+
+
+/* Other functions declared in <iup.h> and implemented here. 
+IupGetDialog
+IupDetach
+IupAppend
+IupGetChild
+IupGetNextChild
+IupGetBrother
+IupGetParent
+*/
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif