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Performing an action when a data store finishes loading

I'm trying to catch an event when my datastore finishes loading the data originally, but I can't seem to get it.
I need to modify some data (client side) before a grid uses the data.
I've tried connecting to the onLoad, onNew and constructor events with no success.

Here's my last attempt:

<div pdojoType="protecht.ProtechtLazyLoadStore" jsId="questionStore" additionalProperties="controls" url="data.txt"></div>
               
        <script type="text/javascript">
                pdojo.addOnLoad(function(){
                                pdojo.connect( questionStore, "onNew", "test123");
                        });
                       
                function test123( )
                {
                        console.log( questionStore._getNewFileContentString() );
                }
        </script>

I'm pretty sure I'm missing something simple here, any help would be gratefully recieved.