Have child views take focus when added to StackView.

src/lib.rs

@@ -199,6 +199,7 @@ impl Cursive {
     /// It will wait for user input (key presses) and trigger callbacks accordingly.
     /// Blocks until quit() is called.
     pub fn run(&mut self) {
+
         // And the big event loop begins!
         while self.running {
             // Do we need to redraw everytime?

src/view/stack_view.rs

@@ -26,7 +26,8 @@ impl StackView {
     }
 
     /// Add new view on top of the stack.
-    pub fn add_layer<T: 'static + View>(&mut self, view: T) {
+    pub fn add_layer<T: 'static + View>(&mut self, mut view: T) {
+        view.take_focus();
         self.layers.push(Layer {
             view: Box::new(ShadowView::new(view)),
             size: Vec2::new(0,0),