Rendering HTML Tags in a GridView Cell

I have a gridview and I want to insert inside a cell a panel, inside which I want to display html tags. Instead, I see html tags in the text. Any ideas?

   protected void grdThreat_RowDataBound(object sender, GridViewRowEventArgs e)
{

    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        Panel mainPanel = new Panel(); 
        mainPanel.Controls.Add(new LiteralControl(e.Row.Cells[4].Text)); 
            e.Row.Cells[4].Controls.Add(mainPanel);
    }
}