CPF/CPF.Razor/Controls/Panel.cs

using Microsoft.AspNetCore.Components;
//using Microsoft.MobileBlazorBindings.Core;
using System;
using System.Collections.Generic;
using System.Text;

namespace CPF.Razor.Controls
{
    public partial class Panel : Element<CPF.Controls.Panel>
    {
        //[Parameter] public string Background { get; set; }

        [Parameter] public RenderFragment ChildContent { get; set; }
        protected override RenderFragment GetChild() => ChildContent;
    }
}