How set widget as current

[Coder5546]

Hi, when I trying to open QDialog or QWidget from other QWidget, opened widget is 'frozen' - not current, but when I close first widget, second widget is active.
How set new widget as current when is open from first widget ?

My code (first QWidget)

connect(mailbox, SIGNAL(tokenRequired(MailSystem*)), Token::getInstance(), SLOT(onTokenRequired(MailSystem*)));

connect(mailbox, SIGNAL(tokenRequired(MailSystem*)), Token::getInstance(), SLOT(onTokenRequired(MailSystem*)));

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End Token.h constructor

namespace Ui {
class Token;
}
 
class Token : public QWidget
{
    Q_OBJECT
 
public:
    explicit Token(QWidget *parent = 0);
    static Token *getInstance()
    {
        static Token *instance = new Token;
        return instance;
    }
...
}

namespace Ui {
class Token;
}

class Token : public QWidget
{
    Q_OBJECT
    
public:
    explicit Token(QWidget *parent = 0);
    static Token *getInstance()
    {
        static Token *instance = new Token;
        return instance;
    }
...
}

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Regards