This example shows how to add an info windows to a marker. The windows will open when you click on the marker

<% Html.Telerik().Googlemap()
                    .Name("map")
                    .Markers(marker => marker.Add()
                                            .Title("Click to Open an InfoWindow")
                                            .Window(window => window.Add()
                                                                    .Content(() =>{%> 
    <div id="content">
        <div id="siteNotice">
        </div>
        <h1 id="firstHeading" class="firstHeading">
            La Havana</h1>
        <div id="bodyContent">
            <p>
                <b>Havana</b> (<a href="/wiki/Spanish_language" title="Spanish language">Spanish</a>:
                <span lang="es" xml:lang="es"><i><b>La Habana</b></i></span> officially <i>Ciudad de
                    La Habana</i>,<sup id="cite_ref-2" class="reference">
                    <a href="#cite_note-2"><span>[</span>3<span>]</span></a></sup>)
                is the <a href="/wiki/Capital_city" title="Capital city">capital city</a>, major
                port, and leading commercial centre of <a href="/wiki/Cuba" title="Cuba">Cuba</a>.
                The city is one of the 14 <a href="/wiki/Provinces_of_Cuba" title="Provinces of Cuba">
                    Cuban provinces</a>. The city/province has 2.1 million inhabitants, the largest
                city in Cuba and the second largest in the <a href="/wiki/Caribbean" title="Caribbean">
                    Caribbean region</a>.<sup id="cite_ref-3" class="reference">
                    <a href="#cite_note-3"><span>[</span>4<span>]</span></a></sup>
                The city extends mostly westward and southward from the bay, which is entered through
                a narrow inlet and which divides into three main harbours: Marimelena, Guanabacoa,
                and Atarés. The sluggish <a href="/wiki/Almendares_River" title="Almendares River">Almendares
                    River</a> traverses the city from south to north, entering the <a href="/wiki/Straits_of_Florida"
                        title="Straits of Florida">Straits of Florida</a> a few miles west of the
                bay.</p>
        </div>
    </div>


                                                                    <%})
                                                    )
                            ).Render(); %>