title: Run method in other UserControl in WPF
body: <p>On attached picture I show simple layout of a window. Can't figure it out how to launch a method in User Control in middle screen (see pic). What I want to achieve is, when I type in something in search box, list in currently visible User Control will filter to find desired phrase. Side buttons are to switch between different User Controls with different lists.
  I know how to filter listview etc, just can't figure it out how to pass it to different User Control.</p>
  
  <p><a href="https://i.stack.imgur.com/S0tTU.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/S0tTU.png" alt="Window Layout"></a></p>