How can I make the children widget visible when the parent mainwindow transparent?

[aamer4yu]

Does Win CE version of Qt support Style sheets ?
If yes, u may use the style sheet

[charlse]

Does Win CE version of Qt support Style sheets ?
If yes, u may use the style sheet

I used the setStyleSheet() but it can't make the mainwindow transparent , If I set the alpha's value 0 , the mainwindow's background-color changed black .