Connecting text with a line

[Julian Hagenauer <hagenauer uni-heidelberg de>]

Hi,
i want to draw a tree. 
The nodes should be text, and lines should connect the nodes.
With dia it seems not possible to connect text with lines.
So, the only way arround it seems to be using simple boxes with text.
However, boxes have borders that i do not want.
Setting the linewidth of the border to 0 does not
keep dia from drawing the borders (a bug?)

Can you give me some advice, how i can link just text-labels with lines?

Thank you very much,
Julian