C# - Accessing Inner Value Of Web User Control?

Surprised that i havent been able to find this myself, but anyway. Let's say i use my web user control like this:

<myprefix:mytag userid="4" runat="server">Some fancy text</myprefix:mytag>

How would i be able to access the text inside the tags from its codebehind ("Some fancy text")? Was expecting it to be exposed through this.Text, this.Value or something similar.

EDIT:

I even get the following warning on the page where i try to user it:
Content is not allowed between the opening and closing tags for element 'mytag'.

EDIT2:

public partial class mytag: UserControl
{
public int ItemID { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
}
}