Jquery UI Dialog AutoResize Not Working?

I want to resize the Dialog height based on it's content loaded. Currently, it loads fine, just not resizing. What am I doing incorrectly?

<style>
       .ui-dialog-titlebar { 
           display:none;
       }
        .ui-dialog{
          position:fixed;
        }      
    </style>

 <div id="_MyDialog"></div>

function function2(unitId) 
{
        InitializeDialog($("#_MyDialog"), unitId);
        $("#_MyDialog").dialog("open");
    }

function InitializeDialog($element, id) 
{
            $element.dialog({
                open: function (event, ui) {
                    $element.load("/Reader/GetResults/" + id);
                },
                autoOpen: false,
                autoResize: true,
                width: 350,
                height: 'auto',
                minHeight: 450,
                position: { my: 'top', at: 'top+50', of: window, position: 'fixed' },
                resizable: false,
                draggable: false,
                title: "",
                model: false,
                show: "show",
                hide: "hide",               
                closeOnEscape: true,               
                close: function () {
                    $(this).dialog('close');
                }
            });
        }

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