But Now I have found the solution
When triggering a onClick event the this object will contain a XspEventHandler and
this object has a method called getParameters() this method will return a Java ArrayList.
The arraylist will contain the parameters with name and value.
So to print all parameters you can walk thru them like this
var value=this.getParameters();
var tmp="";
for(x=0;x<value.size();x++){
tmp+=value.get(x).getName()+" - "+value.get(x).getValue();
}
tmp will then contain a string will all the names and data of the event parameters for you to display.
Check out my article in the application development wiki