Telerik MVC

Here i am explaining the problem that i encounter during my project. I have a project of MVC4 in that i am using Telerik controls(not kendo & not rad). The Scenario is like this,
"I have a Telerik grid in that i am showing 20 records, in this grid i have an edit button at the end of each record. When i am clicking on edit button it shows a Telerik popUp window(which is a partial view) in that window i have used one collapsible control,
first time when i click on edit button it shows the popup window at center of the screen but when i am expanding the collapsible the window goes to bottom of the screen.

here is my popup window code:

function showEditLookup(CustomerId) {
 
<pre>
    addCustomerLookup = $.telerik.window.create({
        title: &#39;Edit Company&#39;,
        resizable: false,
        modal: true,
        height: 553.6,
        width: 600,
        contentUrl: &#39;/BD/ShowEditCustomerWindow?CustomerId=&#39; + CustomerId,
        onClose: function () {
            removeJqueryValidationMsg();
            $(this).remove();
        }
    });
    var win = addCustomerLookup.data(&#39;tWindow&#39;);
    win.center().open();
}</pre>

Here is My collapsible control Code:

<tr><tdcolspan="2"><divclass="notPrint"><aclass="t-icon t-plus"href="#"id="img_MoreInfo"title="More Info"/><bstyle="font-size:14px;">More Info</b></div><tablestyle="width:100%; display:none;"class="i-info-tbl"id="tblMoreInfo"> 
                    <tr><td>FollowUp Date 
                        </td><td>
                            @Html.TextBoxFor(model => model.Followupdate, new { @class = "DynamicDatePicker",style = "width:120px;"})
                        </td></tr><tr><td>Note
                        </td><td>
                            @Html.TextAreaFor(model => model.Note, new { style = "width:225px;" })
                        </td></tr><tr><td>Account Strategy
                        </td><td>
                            @Html.TextAreaFor(model => model.AccountStrategy, 5, 80, new { style = "width:225px;" })
                        </td></tr><tr><td>Decision Making Process
                        </td><td>
                            @Html.TextAreaFor(model => model.DecisionMakingProcess, 5, 80, new { style = "width:225px;" })
                        </td></tr></table> 
<pre></pre>