[BioC] Rgraphviz multiline edge label

[Ludovica Montanucci [guest]]

Hello,
I am plotting a graph using Rgraphviz and I would like some long edge labels to be written in more than one line.
However, when using \n to insert newline character, only the first line is displayed as edge label.
In this example code:

library("graph")
library("Rgraphviz")
g<-new("graphNEL", nodes=c("node1","node2"), edgemode="directed")
g <- addEdge("node1","node2",g)
eAttrs <- list()
eAttrs$label=c("node1~node2"="First\nlong\nlabel")
plot(g, edgeAttrs=eAttrs)

The edge label plotted is just "First".
Does anyone has a clue on how to plot multiline edge labels with Rgraphviz?
Thank you


 -- output of sessionInfo(): 

> sessionInfo()
R version 2.15.1 (2012-06-22)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US       LC_NUMERIC=C         LC_TIME=en_US       
 [4] LC_COLLATE=en_US     LC_MONETARY=en_US    LC_MESSAGES=en_US   
 [7] LC_PAPER=C           LC_NAME=C            LC_ADDRESS=C        
[10] LC_TELEPHONE=C       LC_MEASUREMENT=en_US LC_IDENTIFICATION=C 

attached base packages:
[1] grid      stats     graphics  grDevices utils     datasets  methods  
[8] base     

other attached packages:
[1] Rgraphviz_2.2.1 graph_1.36.2   

loaded via a namespace (and not attached):
[1] BiocGenerics_0.4.0 stats4_2.15.1      tools_2.15.1    

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