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Looks like rqt - Writing a C++ Plugin is little incomplete. Since I did commented out all instances of QT ( Ui::MyPluginWidget ui_; QWidget* widget_; ) BUT LEFT Q_OBJECT in MyPlugin class this was the source of the problem. I am intending to update above link in couple of days and clean it up with my finding/corrections/notes. Also will try to add missing C++ UI writeup

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