You need to use a delegation, like this:
$(document).on('click',
'.SlideToggle', function() {
var $btn = $(this);
var $container = $btn.find(".some-common-container");
var
$comments = $container.find('.SlideComments');
});
However, your jsFiddle is
unusable. You can't use PHP in jsFiddle, and I can't
guess what HTML your PHP code might produce.