Passing click event/Data to UserControl

Question

Hello,

I have a usercontrol in my Mainwindow xaml. 

I have  button on my Mainwindow.

When I click the button I want to fire a event in the usercontrol.

 Currently:

The Usercontrol x:Name ="UCTile"

 I'm getting a assembly reference error/

any thoughts?

  private void Left_hand(object sender, RoutedEventArgs e)
  {
   UCTile qtv = new UCTile();
qtv.PrintTile.MinimizedItemsPosition = Dock.Left;