Add custom DataView in Customized Section

I add 3 buttons to customized case section.

With this code:

define("CaseSection", [], function() {
    return {
        entitySchemaName: "Case",
        details: /**SCHEMA_DETAILS*/{}/**SCHEMA_DETAILS*/,
        attributes: {},
        methods: {
            getDefaultDataViews: function() {
                var baseDataViews = this.callParent(arguments);
                baseDataViews.GridDataViewMyCases = {
                    name: "GridDataViewMyCases",
                    caption: this.get("Resources.Strings.MyCasesButtonCaption"), // Section header
                    hint: this.get("Resources.Strings.MyCasesButtonCaption"), // Hint for button
                    icon: this.get("Resources.Images.MyCasesDataViewIcon") // Image for button
                };
                baseDataViews.GridDataViewTeamCases = {
                    name: "GridDataViewTeamCases",
                    caption: this.get("Resources.Strings.TeamCasesButtonCaption"), // Section header
                    hint: this.get("Resources.Strings.TeamCasesButtonCaption"), // Hint for button
                    icon: this.get("Resources.Images.TeamCasesDataViewIcon") // Image for button
                };
                baseDataViews.GridDataViewManager = {
                    name: "GridDataViewManager",
                    caption: this.get("Resources.Strings.ManagerButtonCaption"), // Section header
                    hint: this.get("Resources.Strings.ManagerButtonCaption"), // Hint for button
                    icon: this.get("Resources.Images.ManagerDataViewIcon") // Image for button
                };
                return baseDataViews;
            },
            loadActiveViewData: function() {
                var activeViewName = this.getActiveViewName();
                if (activeViewName === "GridDataViewMyCases") {
                    this.loadGridData();
                }
                else if (activeViewName === "GridDataViewTeamCases") {
                    this.loadGridData();
                }
                else if (activeViewName === "GridDataViewManager") {
                    this.loadGridData();
                }
                this.callParent(arguments);
            },
            loadGridDataView: function(loadData) {
                var gridData = this.getGridData();
                if (gridData && loadData) {
                    gridData.clear();
                }
                this.setViewFilter(this.get("ActiveViewName"));
                this.reloadGridColumnsConfig(false);
                this.reloadSummaryModule();
                this.callParent(arguments);
            },
            loadGridDataViewMyCases: function(loadData) { // "load" + DataView.name
                this.loadGridDataView(loadData);
            },
            loadGridDataViewTeamCases: function(loadData) { // "load" + DataView.name
                this.loadGridDataView(loadData);
            },
            loadGridDataViewManager: function(loadData) { // "load" + DataView.name
                this.loadGridDataView(loadData);
            },
            setActiveView: function(activeViewName) {
                this.callParent(arguments);
                if (activeViewName === "GridDataViewMyCases") {
                    this.set("IsGridDataViewVisible", true);
                }
                else if (activeViewName === "GridDataViewTeamCases") {
                    this.set("IsGridDataViewVisible", true);
                }
                else if (activeViewName === "GridDataViewManager") {
                    this.set("IsGridDataViewVisible", true);
                }
            },
            setViewFilter: function(activeViewName) { // Add filter for your "DataView"
                var sectionFilters = this.get("SectionFilters");
                if (activeViewName === "GridDataViewMyCases") {
                    sectionFilters.add("FilterB2BType", this.Terrasoft.createColumnFilterWithParameter(
                        this.Terrasoft.ComparisonType.NOT_EQUAL, "Status.Id", "3E7F420C-F46B-1410-FC9A-0050BA5D6C38"));
                }
                else if (activeViewName === "GridDataViewTeamCases") {
                    sectionFilters.add("FilterB2BType", this.Terrasoft.createColumnFilterWithParameter(
                        this.Terrasoft.ComparisonType.NOT_EQUAL, "UsrStatus", "Closed"));
                }
                else if (activeViewName === "GridDataViewManager") {
                    sectionFilters.add("FilterB2BType", this.Terrasoft.createColumnFilterWithParameter(
                        this.Terrasoft.ComparisonType.NOT_EQUAL, "UsrStatus", "Closed"));
                } else {
                    sectionFilters.removeByKey("FilterB2BType");
                }
            }
        }
    };
});

I defined all strings (MyCasesButtonCaption, MyCasesDataViewIcon, TeamCasesButtonCaption, TeamCasesDataViewIcon, ManagerButtonCaption, ManagerDataViewIcon) on case section structure.

But when I select one of them, the button disappears:

Can you help me?

Regards