EPiServer.Core.XhtmlString error

I want to have a XHTMLString property so that the editors can edit the text as they want. I have tried with and without the attribute [UIHint(UIHint.LongString)] and it causes the same error:

Unable to cast object of type 'System.String' to type 'EPiServer.Core.XhtmlString'.

the code, HTML and EPiServer property:

<div>                                    
     @Model.CurrentPage.Text</div>

 [Display(
           GroupName = SystemTabNames.Content,
           Name = "Text",
           Description = "The text",
           Order = 1)]
[UIHint(UIHint.LongString)]
public virtual XhtmlString Text { get; set;}

What am I missing? I'm using EPiServer 7