title: checked context menu items don't stay checked
body: <p>I'm new to this forum and to android development itself so my question will probably be a very stupid one and i apologize for this .
  I began reading the Dev Guide on developer.android.com and until the part with the context menus everything worked pretty fine. 
  Now i tried to have a context menu with a submenu that contains some checkable items. So i added the submenu and the items to my menu.xml and some item.setchecked(true) methods to my onContextItemSelected(...) method.</p>
  
  <p>menu.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;  
    &lt;menu xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;item android:id="@+id/info"
          android:title="@string/info" /&gt;
      &lt;item android:title="@string/change"&gt;
          &lt;menu&gt;
             &lt;item android:id="@+id/checkable_item1"
                 android:checked="true"
                 android:checkable="true"
                 android:title="@string/hello"/&gt;
             &lt;item android:id="@+id/checkable_item2"
                 android:checkable="true"
                 android:title="@string/moin"/&gt;
             &lt;item android:id="@+id/checkable_item3"
                 android:checkable="true" 
                 android:title="@string/aloha"/&gt;
         &lt;/menu&gt;
    &lt;/item&gt;   
  &lt;/menu&gt;
  </code></pre>
  
  <p>part of my .java file</p>
  
  <pre><code>...
  @Override
  public void onCreateContextMenu(ContextMenu menu, View v,
        ContextMenuInfo menuInfo)
  {
     super.onCreateContextMenu(menu, v, menuInfo);
     MenuInflater inflater1 = getMenuInflater();
     inflater1.inflate(R.menu.context_menu, menu);
  }
  @Override
  public boolean onContextItemSelected(MenuItem item)
  {
     switch(item.getItemId())
     {
     case R.id.checkable_item1:
        if(item.isChecked()) item.setChecked(false);
        else item.setChecked(true);
        return true;
     case R.id.checkable_item2:
        if(item.isChecked()) item.setChecked(false);
        else item.setChecked(true);
        return true;
     case R.id.checkable_item3:
        if(item.isChecked()) item.setChecked(false);
        else item.setChecked(true);
        return true;
     default:
        return super.onContextItemSelected(item);
     }
  }
  ...
  </code></pre>
  
  <p>Now the problem is that when i open the menu and press one of the checkable items and i can see that the green tick pops up in the little box just before the context menu closes but when i open up the menu again the tick is gone. 
  Now i don't really know why the tick doesn't stay in the box. 
  It would be nice if someone could give me hint and tell me what i'm doing wrong.
  thanking you in anticipation </p>
  
  <p>jean-claude91</p>