Changing the Property of a Brush Colour through a Thread

I have a Brush Colour which I would like to change every so and so on a thread.

static SolidColorBrush myBrush;

Thread changeColourThread = new Thread(changeColour);

static void changeColour()
{
       myBrush = new SolidColorBrush(Color.FromArgb(255, 33, 96, 22));
}
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This returns an UnauthorizedAccessException, what's the best way to handle this?

Thanks

You're going to need to use the dispatcher, try this thread.

It looks like creating SolidColorBrush has to be done in UI thread (no idea why). I had similar problem and my solution is to return just Color and then use Converter to convert it into a Brush in .xaml.