[Qt-interest] How to change central widget in Qt Designer?

[donglongchao]

Hi,all

I am new here and Qt.I want to create a MDI app with Qt.And I want to build the main window with Qt Designer.But I can not change the central widget from QWidget to QWorkspace(Ihave to use this class for MDI).Could someone tell me how to do it in Qt Designer ,but no in codes?
Thanks a lot.
Wish you happy.

Longchao
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