@namespace TestComponents
@using System.Diagnostics;
@using Sandbox.UI;

@if ( ShowFirstElement)
{
    <div @ref=MyReferencedElement>@this</div>
}
<div @ref=MyReferencedMarkup>markup content</div>

@code 
{
    public Panel MyReferencedElement{ get; set; }
    public Panel MyReferencedMarkup{ get; set; }
    public bool ShowFirstElement { get; set; } = true;
}