subclass qpushbutton

[Cremers]

I want to subclass QPushButton

somefile.h
//--------------------------------------
class Button : public QPushButton
{
Q_OBJECT
public:
 Button(QWidget *parent);
 Button(const QString &text, QWidget *parent);
};
 
somefile.cpp
/*------------------------------------------------------------------------------------*/
Button::Button(const QString & text, QWidget * parent = 0 )
{
this->setText(text);
}
/*------------------------------------------------------------------------------------*/
Button::Button(QWidget *parent) : QPushButton(parent)
{
}

somefile.h
//--------------------------------------
class Button : public QPushButton
{
Q_OBJECT
public:
 Button(QWidget *parent);
 Button(const QString &text, QWidget *parent);
};

somefile.cpp
/*------------------------------------------------------------------------------------*/
Button::Button(const QString & text, QWidget * parent = 0 )
{
this->setText(text);
}
/*------------------------------------------------------------------------------------*/
Button::Button(QWidget *parent) : QPushButton(parent)
{
}

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However, I get 'no matching function for call to char[]' errors on code that calls them like this: okButton = new Button("Ok");
How is this done, it should convert the char[] somehow to const QString?
If I call them with okButton = new Button(QString("ok")); I also get the error because of the missing parent.
I'm obviously new at this.
Thanks.