title: MvvmCross - Setting EditText to void doesn't update ViewModelProperty
body: <p>I have a problem with Android <code>editText</code> and MvvmCross.
  When I set the <code>editText</code> (which contains a number) to void (with delete) it doesn't affect the ViewModel Property.</p>
  
  <p>It doesn't depend on my code, it can be reproduce in the api example of MVVMCross : </p>
  
  <p>AXML : </p>
  
  <pre><code>&lt;TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Enter a number..." /&gt;
  &lt;EditText
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:inputType="numberDecimal|numberSigned"
      android:textSize="30dp"
      local:MvxBind="Text DoubleProperty" /&gt;
  </code></pre>
  
  <p>ViewModel : </p>
  
  <pre><code>private double _doubleProperty = 42.12;
  
  public double DoubleProperty
  {
      get { return _doubleProperty; }
      set { _doubleProperty = value; RaisePropertyChanged(() =&gt; DoubleProperty); }
  }
  </code></pre>
  
  <p><a href="http://i.stack.imgur.com/ODa8Q.png" rel="nofollow">screenshot from API Example</a></p>