misc fixes

step1-07/exercise/src/TodoApp.tsx

@@ -10,7 +10,24 @@ export class TodoApp extends React.Component<any, { todos: Todos; filter: Filter
   constructor(props) {
     super(props);
     this.state = {
-      todos: {},
+      todos: {
+        '04': {
+          label: 'Todo 4',
+          completed: true
+        },
+        '03': {
+          label: 'Todo 3',
+          completed: false
+        },
+        '02': {
+          label: 'Todo 2',
+          completed: false
+        },
+        '01': {
+          label: 'Todo 1',
+          completed: false
+        }
+      },
       filter: 'all'
     };
   }

step1-07/exercise/src/components/TodoHeader.tsx

@@ -26,7 +26,7 @@ export class TodoHeader extends React.Component<any, any> {
   }
 
   _onFilter = evt => {
-    this.props.setFilter(evt.target.textContet);
+    this.props.setFilter(evt.target.innerText);
   };
 
   _onChange = evt => {