title: WPF/XAML/C# Setting a Boolean variable on MouseOver
body: <p>If I have a <strong>boolean</strong> variable in a <strong>ViewModel</strong> Class, lets say</p>
  
  <p><code>public bool test = true;</code> (This is in C#)</p>
  
  <p>Is there ANYWAY in XAML/Expression Blend to take this variable and change it to 
  false USING PURELY XAML, no code behind or anything?</p>
  
  <p>I want to do this for a mouse over event.
  If the mouse is over a certain object the boolean variable should become false, otherwise it should remain true.</p>