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        const userButton = this.viewer.jsObject.SmallButton('userButton', 'X', null);

        userButton.action = function () {
          this.myMethod();
        };
        const toolbarTable = this.viewer.jsObject.controls.toolbar.firstChild.firstChild;
        const buttonsTable = toolbarTable.rows[0].lastChild.lastChild;
        const userButtonCell = buttonsTable.rows[0].insertCell(0);
        userButtonCell.className = 'stiJsViewerClearAllStyles';
        userButtonCell.appendChild(userButton);
        userButton.myMethod = this.onClose;
        userButton.modalService = this.modalService;
        userButton.outResult = this.outResult;
        userButton.id = 'userButton';

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<script>
        var createButton = function () {
            var customButton = this.WebViewer1.SmallButton("customButton", "Custom Button", "emptyImage");
            customButton.image.src = "https://www.stimulsoft.com/images/logo_16.png";
            customButton.action = function () {
                alert("Custom Button Event");
            }
            var toolbarTable = this.WebViewer1.controls.toolbar.firstChild.firstChild;
            var buttonsTable = toolbarTable.rows[0].firstChild.firstChild;
            var customButtonCell = buttonsTable.rows[0].insertCell(0);
            customButtonCell.appendChild(customButton);
        }
    </script>

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 <StiBlazorViewer ID="WebViewer1" OnInitializedEvent="@OnInitializedViewer" OnAfterRenderEvent="@OnAfterRenderViewer" />

    private async void OnInitializedViewer()
    {
        Stimulsoft.Base.StiFontCollection.AddFontFile("wwwroot/fonts/arial.ttf");
        Stimulsoft.Base.StiFontCollection.AddFontFile("wwwroot/fonts/arial-bold.ttf");
        await Task.CompletedTask;
    }

    private void OnAfterRenderViewer()
    {
        JSRuntime.InvokeVoidAsync("createButton");
    }

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 Unhandled exception rendering component: Object of type 'Stimulsoft.Report.Blazor.StiBlazorViewer' does not have a property matching the name 'OnAfterRenderEvent'.