There is a way to force an external window to become part of a widget, but the API isn't really meant to be used this way and there are multiple issues: https://bugreports.qt.io/browse/QTBUG-45275

@mrjj
Thanks for the reply!
I followed your advice and tried setting the panelWindow as the parent...
No change..

Any other ideas?
I followed this link,
http://doc.qt.io/qt-5/qmacnativewidget.html#details

Hi
Have a look at
http://doc.qt.io/qt-5.5/qtextobjectinterface.html#details
http://doc.qt.io/qt-5/qtextobjectinterface.html
and the "Text Object Example"
It seems possible to create your own widget to support such feature but
I have no tested it and do not know if object would receive events.
also docs says
"Copy and Paste operations ignore custom text objects."

Hi and welcome to devnet,

Glad you found out and thanks for sharing !

Since you have it working now, please update the thread title prepending [solved] so other forum users may know that a solution has been found :)