diff -r 04039e47ac74 -r bf3ea1f1520b treeitem.h
--- a/treeitem.h	Tue Apr 28 09:51:48 2009 +0000
+++ b/treeitem.h	Tue Apr 28 20:53:44 2009 +0000
@@ -25,28 +25,28 @@
     ~TreeItem();
 	void init();
 
-	QString saveToDir (const QString &tmpdir,const QString &prefix, const QPointF& offset);
+	virtual QString saveToDir (const QString &tmpdir,const QString &prefix, const QPointF& offset);
 
 
 	// General housekeeping
-	void setModel (VymModel *m);
-	VymModel* getModel();
+	virtual void setModel (VymModel *m);
+	virtual VymModel* getModel();
 
-    void appendChild (TreeItem *child);
-	void removeChild (int row);
+    virtual void appendChild (TreeItem *child);
+	virtual void removeChild (int row);
 
-    TreeItem *child(int row);
-    int childCount() const;
-    int childNumber() const;
-    int columnCount() const;
-	int branchCount() const;
-	int imageCount() const;
-	int xlinkCount() const;
+    virtual TreeItem *child(int row);
+    virtual int childCount() const;
+    virtual int childNumber() const;
+    virtual int columnCount() const;
+	virtual int branchCount() const;
+	virtual int imageCount() const;
+	virtual int xlinkCount() const;
 
-    int row() const;
-	int column() const;
-	int depth() ;
-    TreeItem *parent();
+    virtual int row() const;
+	virtual int column() const;
+	virtual int depth() ;
+    virtual TreeItem *parent();
 
 	/*! Return number of item in parent by type, 
 	    e.g. first branch has number 0           */