I have been using HTML in formula fields for some time and no problem at all. Today I was developing an application where the HTML code in the field resulted in plain text shown in the view. Is there anything I am missing?

I am talking about a code of this sort: 

(("<a style='white-space:nowrap;background:#3A5999;border:1px solid #4165C5;color:#ffffff' href=\"#View:Detailed_View?MOB_idstr=") + MOBID) + "\">View Details</a>"

below you can see what I am talking about, the field Titulo is a formula field showing the HTML text rather than recognizing the HTML tags...