title: Some attributes are not available when "Minimum SDK" is less than the Build SDK
body: <p>I just faced to a weired problem in Android. That is, I created my project in eclipse using default settings. Eclipse has applied "Android 2.3.3 (API10) as the "Build SDK" and "API8:Android 2.2 (Froyo)" as the "Minimum required SDK. </p>
  
  <p>However, I asked a question <a href="https://stackoverflow.com/questions/13014440/setting-up-textboxes-in-same-straight-line/13014536#comment17662128_13014536">here</a> and they have asked me to use the attribute "<code>android:layout_toRightOf</code>" but that attribute wasn't available!! Following were the attributes available which starts with <code>android:layout_</code>, they are width, height, weight, gravity, margin, marginLeft, marginTop, marginRight and marginBottom.</p>
  
  <p>However, then I opened another project with "Android 2.3.3 (API10) as the "Build SDK" and  the same as the "Minimum required SDK". Now, those attributes are there!!</p>
  
  <p>Why is this? Do I have to select the same API as the build sdk and minimum required sdk? Please help! </p>
  
  <p><strong>EDIT</strong></p>
  
  <p>Following code has those attributes, which didn't appear when I am trying to use at the first time</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
   &gt;
  
  &lt;TextView 
      android:id="@+id/firstTextView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="@string/firstNumber"
      android:alignParentLeft="true"
      android:alignParentTop="true"
      /&gt;
  
  &lt;EditText 
      android:id="@+id/firstNumberTxt"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:toRightOf="@+id/firstTextView"
      android:marginLeft=30dp 
      /&gt;
  
  &lt;TextView 
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="@string/secondNumber"
      android:alignLeft="@+id/firstTextView"
      android:below="@+id/firstTextView"
      /&gt;
  
  &lt;EditText 
      android:id="@+id/secondNumberTxt"
      android:layout_width="match_parent"
      android:layout_height="wrap_content" 
      android:alignLeft="@+id/firstNumberTxt"
      android:below="@+id/firstTextView"
      /&gt;
  
       &lt;RadioGroup
           android:id="@+id/radioGroup"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:orientation="horizontal"
           &gt;
  
           &lt;RadioButton 
               android:id="@+id/sum"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:text="@string/sum"
               /&gt;
  
           &lt;RadioButton 
               android:id="@+id/min"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:text="@string/min"
               /&gt;
  
           &lt;RadioButton 
               android:id="@+id/max"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:text="@string/max"
               /&gt;
  
           &lt;RadioButton 
               android:id="@+id/dev"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:text="@string/dev"
               /&gt;
       &lt;/RadioGroup&gt;
  </code></pre>