JavaFX 2.0 :: Select Tree Node On Button Click

I want to develop simple example in which I can select TreeView Nodes with Buttons(in some cases clicking on image and etc). I created this simple sample:
 
<pre style="" _modifiedtitle="true" jivemacrouid="_14032555963537721" ___default_attr="java" jivemacro="code" class="jive_text_macro jive_macro_code jivemacrouid_14032555963537721">
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.geometry.Insets;

[Code] .... 
 
The question is how I can select tree Node when I click on a button. For example when I click on a button Item A1 I want to select tree idem Item A1.