# Can't draw ending arrow using tikz [closed]

I need that red edges become arrows, I use \draw[->] but the end of the drawn line is the same as the beginning, this is not an arrow!

This is my code:

\documentclass[demo]{article}
\usepackage{tikz,tikz-qtree}

\begin{document}
\begin{figure}[ht]\begin{center}\begin{tikzpicture}[grow'=up]
\Tree [.\node(8){8};
[.\node(5){5};
[.\node(3){3};
\node(1){1};
\node(4){4}; ]
\node(6){6}; ]
\node(12){12}; ]
\begin{scope}[shift={(2in,0)}]
\Tree [.\node(H){H};
[.\node(E){E};
[.\node(C){C};
\node(A){A};
\node(D){D}; ]
\node(F){F}; ]
\node(O){O}; ]
\end{scope}
\draw[->,thick,red](8)  to[out=315,in=225] node[below]{g} (H);
\draw[->,thick,red](12) to[out=315,in=225] node[below]{g} (O);
\draw[->,thick,red](5)  to[out=315,in=225] node[below]{g} (E);
\draw[->,thick,red](3)  to[out=315,in=225] node[below]{g} (C);
%etc...
\end{tikzpicture}\end{center}\end{figure}
\end{document}


and this is the image produced:

-

## closed as too localized by Joseph Wright♦Mar 3 '12 at 21:13

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This \draw[thick,red](8) to[->,out=315,in=225] node[below]{g} (H); doesn't work. – tyranitar Feb 18 '12 at 15:53
With your code, I do get the arrows. – Marc van Dongen Feb 18 '12 at 15:54
Indeed, with your code, I also get the arrows. Maybe needs to be compiled a few times. I've deleted my previous comments since they are misleading. – percusse Feb 18 '12 at 15:56
No problem here with pgf 2.1 cvs and the last qtree (engine pdftex) – Alain Matthes Feb 18 '12 at 16:23
I use pdflatex by MiKTeX (Windows) – tyranitar Feb 18 '12 at 17:55