QWizard向导对话框设置最大化按钮无效

[miranda_l_u]

遇到一个小问题，望解答：
调用setWindowFlags()最小化按钮和关闭按钮都有效，但最大化按钮无效。

    Qt::WindowFlags flags = Qt::Dialog;
	flags |= Qt::WindowMinimizeButtonHint;
	flags |= Qt::WindowMaximizeButtonHint;
	flags |= Qt::WindowCloseButtonHint;
	setWindowFlags(flags);

	QWizardPage* page1 = new QWizardPage;
	QWizardPage* page2 = new QWizardPage;
	addPage(page1);
	addPage(page2);

	setWizardStyle(QWizard::ModernStyle);
	setWindowTitle(tr("test wizard"));

效果如图：

[miranda_l_u]

    Qt::WindowFlags flags = Qt::Dialog;
	flags |= Qt::CustomizeWindowHint;  //就是这句！
	flags |= Qt::WindowMinimizeButtonHint;
	flags |= Qt::WindowMaximizeButtonHint;
	flags |= Qt::WindowCloseButtonHint;
	setWindowFlags(flags);

	QWizardPage* page1 = new QWizardPage;
	QWizardPage* page2 = new QWizardPage;
	addPage(page1);
	addPage(page2);

 	setWizardStyle(QWizard::ModernStyle);
	setWindowTitle(tr("test wizard"));

这样就好用了，通过查看文档可知原因：The CustomizeWindowHint flag is used to enable customization of the window controls. This flag must be set to allow the WindowTitleHint, WindowSystemMenuHint, WindowMinimizeButtonHint, WindowMaximizeButtonHint and WindowCloseButtonHint flags to be changed. 另，请参考：http://stackoverflow.com/questions/27496686/cant-hide-or-disable-the-close-button-on-qwizard