QDockWidget move problem when using custom title widget

[alexi_nedo]

Hi,
I want to create a dock widget with a custom title widget. That custom title widget has my own icons (maximize, minimize, close etc). A snapshot of the dock widget is attached.

Source code is simply like that:

QDockWidget *dock =  new QDockWidget("name", parent);
MyDockTitle * titleWidget = new MyDockTitle(dock);
dock->setTitleBarWidget(titleWidget);

QDockWidget *dock =  new QDockWidget("name", parent);
MyDockTitle * titleWidget = new MyDockTitle(dock);
dock->setTitleBarWidget(titleWidget);

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When I run the program, dock widget is shown appropriately but unfortunately I can not move the dock widget (it is in floating state). What can be the problem?

P.S. When I dont use custom title widget, I can move dock widget.

Thanks...