@Title @((IsOpen) ? "−" : "+")

@ChildContent

@code { [Parameter] public string Title { get; set; } = ""; [Parameter] public bool IsOpen { get; set; } [Parameter] public int Level { get; set; } = 0; [Parameter] public EventCallback OnToggle { get; set; } [Parameter] public RenderFragment? ChildContent { get; set; } }