Gantt Chart View not listed in View Selector

Question

View Selector is missing view of type “Gantt” for List based on list template “171” i.e. “TasksWithTimelineAndHierarchy”
Missing Gantt View
Visible in Ribbon
What we have done to create the Gantt view is as follows
We are working with remote provisioning pattern to provision the site and required lists
A Task List is provisioned using CSOM (Managed .Net) via a Provider Hosted App that is hosted as Azure Web Site
We are creating a view based of type “Gantt”
Sample ViewXml used for creating the view. Highlighted below is the property we have set for the same
<View>
<Title>Tasks_View_GanttChart</Title>
<DefaultView>false</DefaultView>
<PersonalView>false</PersonalView>
<RowLimit>30</RowLimit>
<Paged>true</Paged>
<Scope>DefaultValue</Scope>
<ViewType>Gantt</ViewType>         
</View>
Standard View Menu (View Selector) does not show Custom Gantt chart (created via CSOM) in the menu list. Refer screenshot mentioned earlier
Custom Gantt chart view is available in ribbon menu though
The same custom Gantt chart is visible in the standard menu if we are in “out of the box Gantt chart View” (Below ‘OOTB Gant chart’ is created from front end using the template ‘Gantt chart view’)
Sample Code used to create the view
ViewCreationInformation viewInfo = new ViewCreationInformation()
Title = listViewTemplate.Title,
        ViewFields = viewFields,
SetAsDefaultView = isDefaultView,
PersonalView = isPersonalView,
Query = query.ToString(),
RowLimit = rowLimit,
Paged = paged,
ViewTypeKind = viewType
View view = list.Views.Add(viewInfo);
web.Context.ExecuteQuery();
Any clue on this behavior? We have the same issue with Calendar View Type as well for the Calendar List.

Answer 1

I found solution:
You need modify XsltListViewWebPart tool bar option from one value to another, and then back. That solves that bug in SharePoint.
public static void FixGanttIssue(SPList list, string ViewName)
SPSite site = list.ParentWeb.Site;
SPLimitedWebPartManager AllItemsMan = site.RootWeb.GetFile(list.Views[ViewName].Url).GetLimitedWebPartManager(System.Web.UI.WebControls.WebParts.PersonalizationScope.Shared);
XsltListViewWebPart wp = (XsltListViewWebPart)AllItemsMan.WebParts[0];
wp.Toolbar = "Summary Toolbar";
AllItemsMan.SaveChanges(wp);
wp.Toolbar = "Full Toolbar";
AllItemsMan.SaveChanges(wp);