Refresh Mondrian views

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I am trying to implement some visualizations using Mondrian in Pharo 3.0.

My main problem is that I do not find a way to dynamically update the Mondrian view: I am able to remove nodes doing

view removeAllEdgesTo: node;
     removeNode: node.

but I am not able to add nodes, change the layout and so on. I can change the nodes and edges, but the view does not seem to be refreshed.

Another thing I want to do is the following: I have the user dynamically choose a subset of nodes and a color, and I would like to be able to change the color of these nodes.

Is there a way to interact with Mondrian views outside the builtin interactions?

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