debugging Unit Tests, selecting UI elements (Vis.Studio, silverlight)

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Silverlight

testing

I'm having a UI problem in running vs. debugging a Silverlight project. See the code below:

var tree = GetEverySecond(() => sl.Get<Tree>(), 15);

if (tree == null)
    Assert.Fail("Could not find tree");
tree.Nodes[0].Select();

foreach (var Node in tree.Nodes)
{
    var firstCategoryNode = Node;
    foreach (var subNode in firstCategoryNode.Nodes)
    {
        if (subNode.Text == "Variabelen")
            subNode.Select();
    }
}
if (tree.SelectedNode.Text!="Variabelen")
    //Assert.Fail("Could not find variables node in tree");
    throw new NullReferenceException("Could not find variables node in tree");

In other words, walk through the nodes of a tree and look for a sub-node called "Variabelen"

This works fine when I do "Run unit tests"; the node is found, selected, and no exception is thrown.

When I do "Debug unit tests" and put a breakpoint on "subNode.Select();", the breakpoint is hit, but the node apparently isn't selected. If I continue to run from there, the exception is thrown, and the inspector says I still have the first root node selected.

Anyone any ideas?

Thanks!

Jur.