[DefaultValue(false)]
[Parameter]
public bool BeginGroup { get; set; }

<div class="card">
    <DxMenu Title="DevExpress"
            ItemsPosition="ItemPosition.Start">
        <Items>
            <DxMenuItem Text="Products" IconCssClass="oi oi-layers">
                <Items>
                    <DxMenuItem Text="Subscriptions / Packs" />
                    <DxMenuItem Text=".NET Windows Forms Components" />
                    <DxMenuItem Text="Reporting / Printing Suites" />
                    <DxMenuItem Text="VCL Components and Tools" />
                    <DxMenuItem Text="ASP.NET Components" />
                </Items>
            </DxMenuItem>
            <DxMenuItem Text="Support" IconCssClass="oi oi-person">
                <Items>
                    <DxMenuItem Text="Knowledge Base" />
                    <DxMenuItem Text="Documentation" />
                    <DxMenuItem Text="Support Center" />
                    <DxMenuItem Text="Newsgroups" />
                    <DxMenuItem Text="Best Practices" />
                </Items>
            </DxMenuItem>
            <DxMenuItem Text="Documentation" IconCssClass="oi oi-book" BeginGroup="true" />
            <DxMenuItem Text="Demos" IconCssClass="oi oi-monitor" />
            <DxMenuItem Text="Blogs" IconCssClass="oi oi-bell" />
        </Items>
    </DxMenu>
</div>