@Clint-Westwood said in [QBS] How to override product properties?: here has got to be some way to do it from QBS file I'm not sure. But you may ask the question on the discord chat, because there are more peoples. ;)

I also needed this but there was no answer for it anywhere. Here is my solution: Dialog { id: loginDialog title: "Login" modal: true LoginDialog { id: loginPage anchors.fill: parent } footer: DialogButtonBox { id: buttons Button { id: okButton text: qsTr("Ok") DialogButtonBox.buttonRole: DialogButtonBox.InvalidRole Connections { target: okButton function onClicked() { if (CONDITION){ loginDialog.accept() } else { } } } } Button { id: cancelButton text: qsTr("Cancel") DialogButtonBox.buttonRole: DialogButtonBox.RejectRole } } } So my answer is replace standard buttons and handle button clicks yourself.