can't show my QDialog

[sincnarf]

Hello!

I created a custom dialog and here's how I use it.

IADFUQParameterDialog dialog = new IADFUQParameterDialog(this);

IADFUQParameterDialog dialog = new IADFUQParameterDialog(this);

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but on compile has the error
mainwindow.cpp:2222: error: initializing temporary from result of 'IADFUQParameterDialog::IADFUQParameterDialog(QWid get*)'

so I try to use this instead

IADFUQParameterDialog dialog(this); dialog.show();

IADFUQParameterDialog dialog(this); dialog.show();

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and there's no error. But the dialog shows only when I call a message box