rem: QWidget * KMFilterActionIdentity::createParamWidget( QWidget * parent ) const
add: QWidget* KMFilterActionRemoveHeader::createParamWidget( QWidget* parent ) const
context: QWidget * KMFilterActionIdentity::createParamWidget( QWidget * parent ) const{  IdentityCombo * ic = new IdentityCombo( parent );  ic->setCurrentIdentity( mParameter );  return ic;}