title: React native router flux - Don't Pop to Root When Tab Item Pressed
body: <p>I have an app with two tabs: Tab1 and Tab2. There are two scenes: scene1 and scene2 as part of my Tab1 group, where scene1 is the initial view. If I navigate to scene2, then press Tab2, then go back to Tab1, it automatically pops scene2 from Tab1 and goes back to scene1 instead of staying on scene2, which is not the behavior I want.</p>
  
  <p>So my question: is there a way in react-native-router-flux where I can prevent the views popping to the root when I press the tab bar item? Ideally it would only pop to the root view when I'm already viewing a view within the same tab bar item. So in the example above, when I press Tab1 the first time it stays on previous existing view, but if I press it again then it pops to the root. </p>
  
  <p>EDIT: including my code</p>
  
  <pre><code> &lt;Scene key="root"&gt;
      &lt;Scene key="tabbar" tabs tabBarStyle={{ backgroundColor: '#FFFFFF' }} &gt;
        &lt;Scene key="osu" title="OSU" icon={TabIcon}&gt;
          &lt;Scene key="scarlet" component={ScarletScreen} title="Scarlet" initial /&gt;
          &lt;Scene key="gray" component={GrayScreen} title="Gray" /&gt;
        &lt;/Scene&gt;
        &lt;Scene key="um" title="UM" icon={TabIcon}&gt;
          &lt;Scene key="blue" component={BlueScreen} title="Blue" initial /&gt;
          &lt;Scene key="maize" component={MaizeScreen} title="Maize" /&gt;
        &lt;/Scene&gt;
      &lt;/Scene&gt;
  &lt;/Scene&gt;
  </code></pre>