_Added in 4.4_

*<notextile>on <level>:CLOSING:<|@|*>:<commands></notextile>*

Trigger when manually closing a custom window, using [[/halt]] cancels the closing.

_See also [[$target]]._

*Parameters*

&lt;level&gt; - The [[User Access Level]] for the event to trigger.
&lt;@|*&gt; - The [[Matchtarget]] to listen to.
&lt;commands&gt; - The commands to be performed when the event listener's criteria is met.

*Example*

<pre>
on *:CLOSING:@window:echo -ag $target is closing, cancel the closing by halting | halt
</pre>