title: Robotium. waitForActivity() returns false for embedded activity in TabHostActivity
body: <p>I have a TabHostActivity that has 4 tabs (and 4 corresponding Activities). When in the test I click on one of <code>them("Search")</code> the SearchActivity should appear (and it actually does). The problem is that in Robotuim-test I try to wait for this activity using <code>solo.waitForActivity()</code> and it fails even if the Activity is on the screen. Also all view of this activity are not available via <code>solo.getView()</code> - returns nulls.</p>