Flickering while adding nodes

[Eduardo Lidanski <eduardo.lidanski AT pikolab.net>]

Hi,

I have a graph where I add nodes constantly and after some few time 
after each graph.addNode() operation I add an edge of the node.
So I have:
Node n = graph.addNode()
//some time passes
Edge n_a = graph.addEdge()

Normally, the time between adding the node and adding its edge is less 
than 1 second, but in my application I cannot know that for advance, 
since it is possible that no edge is being added.
it works well, but each time a node is added, the whole graph flickers 
... so it is very annoying.
I think that is because the node adds itself at the upper right corner 
of the graph, a second after that it adds its edge, and this causes the 
flickering.
But do you know what can I do to prevent the flickering ?
I tried to create a thread that adds the node and the edge together 
after 1 second if an edge has been found in that second. If not, it adds 
the node alone. This prevents the flickering, but is not good for my 
application.
What else could I do?

I noticed the node appears at the very far end up, so the graph becomes 
for a small second very small, and then the graph appears with its 
normal size again. I think the node is appearing veeery far away, that 
is why the graph changes its actual size for a second. How can I limit 
this?

Thanks
Eduardo