~~Title: OnActivateTab ~~
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The **OnActivateTab** event can be implemented by a [[:scripting:script_add-ins|script add-in]] to receive a notification every time a tab becomes active (i.e. comes to the front of another tab in the same file display).


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$$ (#)**Method Name:**
$$ OnActivateTab
$$ (#)**Argument Type:**
$$ **[[..:scripting_objects:activatetabdata|ActivateTabData]]** 
$$ (#)**Return Type:**
$$ //none//
$$ (#)**Description:**
$$ The **ActivateTabData.oldtab** property identifies the tab that was previously active, and the **newtab** property identifies the new active tab.
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