Vertical scroll bar appears only when I push resize corner in the dialog jQuery

Question

I have a dialog with max-height=400px and the problem when the content height is more than 400px the vertical scroll bar doesn't appear, but when I push the resize corner of the dialog and close it, then re-open it the vertical scroll bar appears and works fine. Any suggestions or thoughts how to solve this issue? here is the ui-dialog and ui-dialog-content:

.ui-dialog {
    max-height: 400px;
    overflow: hidden;
    padding: 0.2em;
    position: absolute;
    width: 300px;
}

.ui-dialog .ui-dialog-content {
    background: none repeat scroll 0 0 transparent;
    border: 0 none;
    overflow: auto;
    padding: 0.5em 1em;
    position: relative;
}

Here is the peice of code where I use this dialog:

<script type="text/javascript">
 function formatViewLink(cellvalue, options, rowObject) {
       return "<a onClick='openDialog("+cellvalue+")'>" + '<img src="images/view_detail.png" />' + "</a>";  
      } 

</script>
<script type="text/javascript">
function openDialog(isobolId) {
                $("#selected_structs").load("${viewUrl}?isobolId="+isobolId);
                $("#selected_structs").dialog('open');
        }
</script>
<@sj.dialog 
        id="selected_structs" 
        title="Version Structures" 
        autoOpen="false" 
        modal="true"
        width="400"
        height="auto"
        position="['center','top']"
>
</@sj.dialog>

Answer 1

I resolved the issue by changing the jquery-ui.css file inside the struts2jquery-plugin-3.3.1.jar . in line 435 the overfolw:hidden to overflow:auto . then I empty the browser's cache and it work like charm :-).