System::SharedPtr<Project> project = System::MakeObject<Project>(dataDir + u"Project5.mpp");
        
// Create a new project task
System::SharedPtr<Task> task = project->get_RootTask()->get_Children()->Add(u"New Activity");
        
// Define new custom attribute
System::SharedPtr<ExtendedAttributeDefinition> text1Definition = ExtendedAttributeDefinition::CreateTaskDefinition(Aspose::Tasks::ExtendedAttributeTask::Text1, nullptr);
project->get_ExtendedAttributes()->Add(text1Definition);
// Add custom text attribute to created task.
task->get_ExtendedAttributes()->Add(text1Definition->CreateExtendedAttribute(System::String(u"Activity attribute")));
        
// Customize table by adding text attribute field
System::SharedPtr<TableField> attrField = System::MakeObject<TableField>();
attrField->set_Field(Aspose::Tasks::Field::TaskText1);
attrField->set_Width(20);
attrField->set_Title(u"Custom attribute");
attrField->set_AlignTitle(System::Drawing::StringAlignment::Center);
attrField->set_AlignData(System::Drawing::StringAlignment::Center);
System::SharedPtr<Table> table = project->get_Tables()->ToList()->idx_get(0);
table->get_TableFields()->Insert(3, attrField);
        
// Save project as MPP
project->Save(dataDir + u"ConfigureTheGantChartViewShowSelectedColumnFields_out.mpp", [&]{ auto tmp_0 = System::MakeObject<MPPSaveOptions>(); tmp_0->set_WriteViewData(true); return tmp_0; }());