title: Blazor Radzen Grid doesn't show any data
body: <p>I'm using Radzen Datagrid in Blazor Webassembly to show some data. I have this easy example on a blazor page:</p>
  <pre><code>@page &quot;/admincenter&quot;
  @using Dashy.Client.Components
  
  &lt;h3&gt;Dashy Administration&lt;/h3&gt;
  
  &lt;RadzenGrid TItem=&quot;Person&quot; Data=&quot;@_employees&quot; Count=&quot;@_count&quot;&gt;
      &lt;Columns&gt;
          &lt;RadzenDataGridColumn TItem=&quot;Person&quot; Property=&quot;FirstName&quot; Title=&quot;First Name&quot; /&gt;
          &lt;RadzenDataGridColumn TItem=&quot;Person&quot; Property=&quot;LastName&quot; Title=&quot;Last Name&quot; /&gt;
          &lt;RadzenDataGridColumn TItem=&quot;Person&quot; Property=&quot;DayOfBirth&quot; Title=&quot;Birthday&quot; /&gt;
      &lt;/Columns&gt;
  &lt;/RadzenGrid&gt;
  
  @code {
  
      private IEnumerable&lt;Person&gt; _employees;
      private int _count;
  
      protected override Task OnInitializedAsync()
      {
          List&lt;Person&gt; persons = new List&lt;Person&gt;();
          var person1 = new Person { Id = new Guid(), FirstName = &quot;Max&quot;, LastName = &quot;Mustermann&quot;, DayOfBirth = new DateTime(1990, 5, 19) };
          var person2 = new Person { Id = new Guid(), FirstName = &quot;Sabine&quot;, LastName = &quot;Sonntag&quot;, DayOfBirth = new DateTime(1992, 4, 29) };
          persons.Add(person1);
          persons.Add(person2);
  
          _employees = persons;
          _count = persons.Count;
  
          return base.OnInitializedAsync();
      }
  }
  </code></pre>
  <p>But this only shows a small grey line like shown in this picture:
  <a href="https://i.stack.imgur.com/NDark.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NDark.png" alt="enter image description here" /></a></p>
  <p>Someone have an idea what i'm missing?</p>