Can't add form widgets to main.xml file Graphical Layout
<p>I'm new to Android and I wonder why I can't drag and drop things like buttons to the display in the main.xml Graphical Layout? It seems like it's locked or something else that I can't figure out on myself. Help is preciated! Thanks! </p>

<p>EDIT: This is my code in xml file</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;TextView xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/textview"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:text="@string/hello"
 /&gt;
</code></pre>
