Problem joining two tikzpictures

Hi all,

        I've drawn two figures network1 and network2. they are drawn as expected.  
Now I want to join them into the same figure and label each one. So I've  
included each one in a node, labelled the node and aligned. You can see  
how in the example below.
Now the result is wrong, node A in second figure is not aligned with nodes  
CB, CC and CD, and node C in network2 is also missplaced. Could you  
explain me what's wrong? I'm using CVS version of pgf.

        Thank you,

        Ignasi

%---------------------------
\documentclass{article}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{tikz}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%

\usetikzlibrary{arrows,positioning}
\begin{document}

\begin{tikzpicture}

\node[label=below:Network 1] (network1) {
\begin{tikzpicture}[font=\small,>=stealth']
\node[rectangle,draw] (A) at (0,0) {Host};
\node[rectangle,draw] (B) at (6,0) {Host};
\draw[-] (A) -- node[above] {Link} (B);
\end{tikzpicture}
};

\node[label=below:Network 2] (network2) [below=of network1] {
\begin{tikzpicture}[font=\small,>=stealth']
\node[rectangle,draw] (A) at (0,0) {Host};
\node[rectangle,draw] (B) at (4,.75) {Host};
\node[rectangle,draw] (C) at (5,-.75) {Host};
\node[rectangle,draw] (D) at (6,.75) {Host};
\node[rectangle,draw] (CB) at (4,0) {};
\node[rectangle,draw] (CC) at (5,0) {};
\node[rectangle,draw] (CD) at (6,0) {};

\draw[-] (A) -- node[above] {Link} (CB) -- (CC) -- (CD);
\draw[-] (CB) -- (B);
\draw[-] (CC) -- (C);
\draw[-] (CD) -- (D);
\end{tikzpicture}
};

\end{tikzpicture}

\end{document}
--
----------------------------------------------------------------------
Ignasi Furió Caldentey
Universitat de les Illes Balears
Escola Politècnica Superior
Dep. Matematiques i Informatica
Cra. Valldemossa, km. 7,5. 07071-Palma. SPAIN
tel: (34) 971.173.196    fax: (34) 971.173.003
e-mail: ignasi dot furio at uib dot cat
http://www.uib.cat
----------------------------------------------------------------------


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