No such signal QRadioButton::toggled()

[jacek]

So isn't it has to be [...]

Not with current toggleManualTab() implementation, since it doesn't take any arguments.

With:

connect( ui.rbManualMode, SIGNAL( toggled( bool ) ),
         this, SLOT( toggleManualTab( bool ) ) );

connect( ui.rbManualMode, SIGNAL( toggled( bool ) ),
         this, SLOT( toggleManualTab( bool ) ) );

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that slot should look like this:

void ConfigurationForm::toggleManualTab( bool bEnableTab )
{
    ui.twConfig->setTabEnabled( 1, bEnableTab );
}

void ConfigurationForm::toggleManualTab( bool bEnableTab )
{
    ui.twConfig->setTabEnabled( 1, bEnableTab );
}

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@bpetty:
If you have similar slots for other tabs, consider using QSignalMapper.