you have to edit global toolkit definition…
in tk-core/python/tank/platform/tankqdialog.py
line aprox 192:
add these:
self.setWindowFlags(self.windowFlags() |
QtCore.Qt.WindowTitleHint |
QtCore.Qt.WindowMaximizeButtonHint |
QtCore.Qt.WindowMinimizeButtonHint |
QtCore.Qt.WindowCloseButtonHint
| QtCore.Qt.Window
)