~~Title: OnActivateLister ~~
<pageheader/>

The **OnActivateLister** event can be implemented by a [[:scripting:script_add-ins|script add-in]] to receive notification whenever a Lister window becomes the active window, or loses activation to another window.


<commandtable columns="2" id="cmdtable_1">
$$ (#)**Method Name:**
$$ OnActivateLister
$$ (#)**Argument Type:**
$$ **[[..:scripting_objects:activatelisterdata|ActivateListerData]]** 
$$ (#)**Return Type:**
$$ //none//
$$ (#)**Description:**
$$ The **ActivateListerData.lister** property identifies the Lister, and the **active** property indicates whether this Lister has become active or inactive. If the activation moves from one Lister to another this event would be called twice, once for each Lister.
</commandtable>