title: How to set ErrorMessage on TextField dynamically on Button onClick method
body: <p>I need to bind ErrorMessage to textfield only when user press button. In this there are nice examples how to use errormessage but the problem is that I don't know how to make append errorMeesage after user click</p>
  
  <pre><code> &lt;TextField id='titleField' value={titleValue} required={true} label={escape(this.props.description)} onGetErrorMessage={this._getErrorMessage} validateOnLoad={false} /&gt;
  </code></pre>
  
  <p>And this is a call of a button:</p>
  
  <pre class="lang-js prettyprint-override"><code>private _buttonOnClickHandler() {
      let textvalue = document.getElementById('titleField')["value"];
  
      if(textvalue === "")
      {
          //call onGetErrorMessage or something that will set ErrorMeesage and input will be red
      }
  
      return false;
  }
  </code></pre>
  
  <p>Thank you</p>