Event Handler Windows Phone 7

I'm using http://babaandthepigman.wordpress.com/2010/09/22/wp7-looping-selector/ as a timer selector

It has an even handler for example

hours.DataSource.SelectionChanged += //not sure what to put here
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I'm not sure what to put after the += and I don't know where the whole code block should be placed in my WP7 app?

I want a button to be enabled when the selector is changed.

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Something like this:

hours.DataSource.SelectionChanged += 
      new EventHandler<SelectionChangedEventArgs>(DataSource_SelectionChanged);

Then create the method like this:

void DataSource_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    // Your code here!
}