Yeah, there isn't an API call for when UI's are created, just destroyed.
http://help.autodesk.com/view/MAYAUL/2017/ENU/?guid=__cpp_ref_class_m_ui_message_html



On Sunday, November 26, 2017 at 7:13:17 PM UTC-6, Justin Israel wrote:
>
>
>
> On Sat, Nov 25, 2017 at 9:35 AM Pritish Dogra <[email protected] 
> <javascript:>> wrote:
>
>> I can add the menu through the following code
>>
>> import pymel.core as pm
>> parent_object = pm.getPanel(sty="graphEditor")[0]
>> pm.menu("test_menu", parent=parent_object, label="Test Menu", tearOff=
>> True
>>
>> However as soon as I tear off the graph editor panel, I lose the menu. 
>> How can I make this permanent for the graph editor window or any other 
>> scripted panel? 
>>
>
> I haven't been setting this stuff up in newer Maya releases (2016+) so my 
> information may be out of date. But ya it is a bit tricky to make custom 
> changes to Maya's interface and have them be persistent when the UI is 
> modified. This is happening because a tear-off is recreating the widget and 
> your injected modifications to the old widget are lost. 
>
> Some options you have to automatically introduce this change is to include 
> setting an event filter 
> <http://doc.qt.io/qt-4.8/eventsandfilters.html#event-filters> on one of 
> the parent objects that don't change. This could end up just being the main 
> window or the QApplication. The event filter would be watching for the 
> ChildAdded <http://doc.qt.io/qt-4.8/qevent.html#Type-enum> event, and if 
> its the expected type of widget you can apply your customization. 
>  
> I don't recall the MMessage API offering any hooks for when arbitrary UI's 
> are created.  
>
>
>> Cheers
>>
>> Pritish
>>
>>
>>
>>
>>
>>
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