protected void clearColumnVisibilityActions(){
  if (columnVisibilityActions == null)   return;
  for (  ColumnVisibilityAction action : columnVisibilityActions) {
    action.releaseColumn();
  }
  columnVisibilityActions.clear();
}

protected void clearColumnVisibilityActions ( ) { if ( columnVisibilityActions == null ) return ; for ( ColumnVisibilityAction action : columnVisibilityActions ) { action . releaseColumn ( ) ; } columnVisibilityActions . clear ( ) ; }
releases actions and clears list of actions .
