Problem of using Qt
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Qt 4.7.4 has no problems like you're describing. We're using it for complex UI's successfully. Do you honestly think it would have been released if you could not use it to put a QPushButton on a form?
Something is wrong with either your code your system setup.
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i try another computer and same problem occur
and the project is newly createdi download the QtSDK from http://qt.nokia.com/downloads and download Linux/X11 64-bit offline installer
i choose custom, and install all the things except 4.8.1 source and qt4.8.1(Desktop) -
Do you get an error message? Does QtCreator output any error message or warning when you start it in the terminal? Does it happen with absolutely all widgets except the vertical/horizontal lines? Does your program run when you add widgets programmatically, i.e. in the main window constructor?