Update the position of a node

[SivanDuijn]

Hi, can i update the position of a node programmaticaly?
For example: The user clicks on a button, the position of a certain node is set to a certain location and the layout adjusts to this.

I can set a node's position like this:

graph.nodes[1].x = 10; 
graph.nodes[1].y = 10;

But this doesn't seem to work..