<p>I'm using Microsoft AjaxControlToolkit for modal popup window.</p>

<p>And on a modal popup window, when a postback occurred, the window was closing. How do I prevent from the closing action of the modal popup?</p>

You can call
```
Show()
```
method during postback to prevent the modal popup window from closing
```
```
MyModalPopoupExtender.Show()
```
```