void FindDerivedClasses(object sender, EventArgs e)
		{
			MenuCommand item = (MenuCommand)sender;
			IClass c = (IClass)item.Tag;
			List<IClass> derivedClasses = RefactoringService.FindDerivedClasses(c, ParserService.AllProjectContents, false);
			
			List<SearchResult> results = new List<SearchResult>();
			foreach (IClass derivedClass in derivedClasses) {
				if (derivedClass.CompilationUnit == null) continue;
				if (derivedClass.CompilationUnit.FileName == null) continue;
				
				SearchResult res = new SimpleSearchResult(derivedClass.FullyQualifiedName, new Point(derivedClass.Region.BeginColumn - 1, derivedClass.Region.BeginLine - 1));
				res.ProvidedDocumentInformation = FindReferencesAndRenameHelper.GetDocumentInformation(derivedClass.CompilationUnit.FileName);
				results.Add(res);
			}
			SearchInFilesManager.ShowSearchResults(StringParser.Parse("${res:SharpDevelop.Refactoring.ClassesDerivingFrom}", new string[,] {{ "Name", c.Name }}),
			                                       results);
		}
		void FindOverrides(object sender, EventArgs e)
		{
			MenuCommand item = (MenuCommand)sender;
			IMember member = (IMember)item.Tag;
			List<IClass> derivedClasses = RefactoringService.FindDerivedClasses(member.DeclaringType, ParserService.AllProjectContents, false);
			List<SearchResult> results = new List<SearchResult>();
			foreach (IClass derivedClass in derivedClasses) {
				if (derivedClass.CompilationUnit == null) continue;
				if (derivedClass.CompilationUnit.FileName == null) continue;
				IMember m = RefactoringService.FindSimilarMember(derivedClass, member);
				if (m != null && !m.Region.IsEmpty) {
					SearchResult res = new SimpleSearchResult(m.FullyQualifiedName, new Point(m.Region.BeginColumn - 1, m.Region.BeginLine - 1));
					res.ProvidedDocumentInformation = FindReferencesAndRenameHelper.GetDocumentInformation(derivedClass.CompilationUnit.FileName);
					results.Add(res);
				}
			}
			SearchInFilesManager.ShowSearchResults(StringParser.Parse("${res:SharpDevelop.Refactoring.OverridesOf}",
			                                                          new string[,] {{ "Name", member.Name }}),
			                                       results);
		}