How to create custom button

[zied_m]

I have created a button named test to the jBPM designer, but I want to know how to add actions automaticly when the button is added. for example:
when I add the button, the XML code is :

<test name="test1"></test>

but I wanted that it adds those XML lines for example:

<test name="test1">
 <action name="Myaction" class="My.Class">
 <a>a value</a>
 <b>b value</b>
 </action>
</test>