QX11EmbedContainer's problem, thanks for you help

[ecbtnrt]

QX11EmbedContainer *container = new QX11EmbedContainer;
container->embedClient(0x221072f); //here is a win ID
container->show();

QX11EmbedContainer *container = new QX11EmbedContainer;
container->embedClient(0x221072f); //here is a win ID
container->show();

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This code is alright I know.
The QX11EmbedContainer is a widget. If you put it on the other widget for example QGraphicsProxyWidget, it can't display anything.


Why?
Thank you!