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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
//! [0]
QDesignerPropertySheetExtension *propertySheet;
QExtensionManager manager = formEditor->extensionManager();
propertySheet = qt_extension<QDesignerPropertySheetExtension*>(manager, widget);
if(propertySheet) {...}
//! [0]
//! [1]
Q_DECLARE_EXTENSION_INTERFACE(MyExtension, "com.mycompany.myproduct.myextension")
//! [1]