Is it possible to resize the child window by clicking the bottom right corner? Something similar to what sfgui does.
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playButton->bindCallback(tgui::Button::LeftMouseClicked);
playButton->setCallbackId(1);
playButton->bindCallback(tgui::Button::MouseEntered);
playButton->setCallbackId(2);
playButton->bindCallback(tgui::Button::LeftMouseClicked | tgui::Button::MouseEntered);