replace a fragment from fragment
<p>I have ActivityFragment with two Fragment
i can start a fragement from the ActivityFragment using :</p>

<pre><code>FragmentTransaction transaction = getSupportFragmentManager()
                .beginTransaction();
transaction.add(R.id.center_layout, new MyFragment());
transaction.commit();
</code></pre>

<p>my problem is when trying to replace <code>MyFragment()</code>  by an other Fragment in <code>R.id.center_layout</code> from <code>MyFragment()</code>  class </p>

<p>i tried </p>

<pre><code>FragmentTransaction transaction =this.getChildFragmentManager()
    .beginTransaction();
transaction.add(R.id.center_layout, client_Ajouter);
transaction.commit();
</code></pre>

<p>but i get </p>

<pre><code>No view found for id 0x7f06000b (center_layout) for fragment Client_Ajouter
</code></pre>

<p>and thank you.</p>
