oqtane.framework/Oqtane.Client/Modules/Controls/TabPanel.razor

@namespace Oqtane.Modules.Controls
@inherits ModuleBase

@if (Name == Parent.ActiveTab)
{
    <div id="@Name" class="tab-pane fade show active" role="tabpanel">
        @ChildContent
    </div>
}
else
{
    <div id="@Name" class="tab-pane fade" role="tabpanel">
        @ChildContent
    </div>
}

@code {
    [CascadingParameter]
    private TabStrip Parent { get; set; }

    [Parameter]
    public RenderFragment ChildContent { get; set; }

    [Parameter]
    public string Name { get; set; } // required - name of the TabPanel

    [Parameter]
    public string Heading { get; set; } // optional - defaults to name if not specified

    protected override void OnInitialized()
    {
        base.OnInitialized();
        Parent.AddTabPanel((TabPanel)this);
    }
}