Javascript – Open branch when clicking on a node

I'm stuck with jsTree here. So far it works and i can browse and expand nodes with the [+] icon and open pages when clicking a node, BUT i still want it to expand all the immediate nodes whenever someone clicks on a node.

i had a look at around for at least 2 hours but couln't find anything. the official website is not very helpfull because they don't have enough examples, and its not very well documented. had a look at this one, but didn't work for me either:
http://luban.danse.us/jazzclub/javascripts/jquery/jsTree/reference/_examples/2_operations.html

i didn't even get an error message in firebug

so here is how my code looks right now,
tree init:

$(function () {
    $("#jstree").jstree({
    ....

function triggered by click on node

.delegate("a","click", function (e) { 
    //click on node
    var page_id = $(this).parent().attr("page_id");
    var idn = $(this).parent().attr("id").split("_")[1];
    /*
            dosnt seem to work either...
    $(this).jstree("openNode", $("#node_"+idn));
    $(this).jstree("openNode", "#node_"+idn);
    */
    page = "index.php?page_id="+page_id;
    //location.href = page;
})

.bind didnt work either:

$(this).bind("open_node.jstree", function (event, data) { 
    if((data.inst._get_parent(data.rslt.obj)).length) { 
        data.inst._get_parent(data.rslt.obj).open_node(this, false); 
    } 
})

does anyone see what i'm missing here…?