I'm in the process of attempting a basic directory system with ModelAdmin. It's obviously all possibly, but when looking through some of the CMS code it goes over my head a little.

I'm using the example of Category and Product. I've added
static $extensions = array(
"Hierarchy",
);
to the Category dataobject
and static $tree_class = 'Category';
to what I've called CategoryAdmin
Then this little beauty
public function SiteTreeAsUL() {
$obj = singleton($this->stat('tree_class'));
$obj->markPartialTree();

if($p = $this->currentPage()) $obj->markToExpose($p);

$siteTreeList = $obj->getChildrenAsUL(
'',

'"<li id=\"record-$child->ID\" class=\"$child->class " . $child->markingClasses() . ($extraArg->isCurrentPage($child) ? " current" : "") . "\">" . ' .
'"<a href=\"admin/directory/Category/ResultsForm?Title=test&ResultAssembly%5BID%5D=ID&ResultAssembly%5BStatus%5D=Status&ResultAssembly%5BTitle%5D=Title&SecurityID=000000&ajax=1\" >" . $child->Title . "</a>" ',
//'"<a href=\"" . Director::link(substr($extraArg->Link(),0,-1), "Category", $child->ID, "edit") . "\" >" . $child->Title . "</a>" ',
$this,
true
);

I was using //'"<a href=\"" . Director::link(substr($extraArg->Link(),0,-1), "Category", $child->ID, "edit") . "\" >" . $child->Title . "</a>" ',
which worked well to edit the tree.
But............. '"<a href=\"admin/directory/Category/ResultsForm?Title=test&ResultAssembly%5BID%5D=ID&ResultAssembly%5BStatus%5D=Status&ResultAssembly%5BTitle%5D=Title&SecurityID=000000&ajax=1\" >" . $child->Title . "</a>" ',
has been giving me a few issues. I think the above code is working but not returning the result to AdminRight? I was getting a lot of errors but the above link makes looks like it would work.

I'm I missing a parameter?
Does anyone have any clues or suggestions?