Re-center Modal Popup with Javascript

Question

I have a modal popup that initially shows some content but expands a div if a checkbox is selected. The modal expands correctly but doesn't recenter unless you scroll up or down. Is there a javascript event I can tack on to my javascript function to recenter the entire modal?

Accepted Answer

Here is what it is:

```
$find('ModalPopupExtenderClientID')._layout();
```

For example:

```
$find('detailsPopUpExtenderId')._layout();
```

and in aspx:

```
<ccl:ModalPopupExtender runat="server" ID="MyPopUpExtender" TargetControlID="pop" PopupControlID="PopUp" BehaviorID="detailsPopUpExtenderId" BackgroundCssClass="ModalBackground" />
```

`BehaviorID` being the property where to set the clientside id.

Re-center Modal Popup with Javascript

Solution

Problem