rem: void KMFilterActionAddHeader::clearParamWidget( QWidget* paramWidget ) const
add: void KMFilterActionIdentity::clearParamWidget( QWidget * paramWidget ) const
context: void KMFilterActionAddHeader::clearParamWidget( QWidget* paramWidget ) const{  QComboBox *cb = (QComboBox*)paramWidget->child("combo");  Q_ASSERT( cb );  cb->setCurrentItem(0);  QLineEdit *le = (QLineEdit*)paramWidget->child("ledit");  Q_ASSERT( le );  le->clear();}