title: How to clear Text in dropdown Search programmatically? flutter
body: <p>I m new to flutter, i tried to clear the text in the dropdown search, but failed.
  I tried :</p>
  <pre><code> _PropertyTypeController.text ='';, 
   _PropertyTypeController.clear(),
  </code></pre>
  <p>all failed.</p>
  <pre><code> return new Container(
          child: DropdownSearch&lt;Type2&gt;(
            //  pop
  
            searchFieldProps: TextFieldProps(
              style: TextStyle(fontSize: 12.0),
              controller: _PropertyTypeController,
              decoration: InputDecoration(
                 
                labelStyle: TextStyle(fontSize: 12.0),
                floatingLabelStyle: TextStyle(fontSize: 12.0),
                suffixIcon: IconButton(
                  icon: Icon(Icons.clear),
                  onPressed: () {
                    _PropertyTypeController.clear();
                  },
                ),
              ),
            ),
            maxHeight: 300,
            dropdownSearchBaseStyle: TextStyle(fontSize: 12.0),
            onFind: (filter) =&gt; getTypeSuggestions(
              filter.toString(),
              
            ),
  
            dropdownSearchDecoration: InputDecoration(
              labelStyle: TextStyle(fontSize: 12.0),
              labelText: &quot;choose a Property Type&quot;,
              contentPadding: EdgeInsets.fromLTRB(12, 12, 0, 0),
              border: OutlineInputBorder(),
            ),
            onChanged: print,
            showSearchBox: true,
  
            popupShape: RoundedRectangleBorder(
              borderRadius: BorderRadius.only(
                topLeft: Radius.circular(24),
                topRight: Radius.circular(24),
              ),
            ),
          ),
          margin: EdgeInsets.only(bottom: 10.0));
    }
  </code></pre>
  <p>Anyway to clear the text in the _PropertyTypeController (TextEditingController) Programmatically
  I want to clear few of the dropdown search's text at once.</p>
  <p>dropdown_search: ^2.0.1</p>
  <p>Thanks</p>