Putting the \title of a BeamerClass presentation in a \block

Question

I'm using a hand made beamer theme that uses the corporate identity standards of my university. However, the \title text on the \titlepage is not set in a \block environment as it is, e.g., in the Darmstadt theme.

Is there a LaTeX command that actually toggles this feature on or off? If yes, is there a way to change the look of the \block environment of the \title without affecting the remaining \block environments on non-title-page slides?

\documentclass[handout]{beamer} % handout 
\usepackage[utf8]{inputenc}
\usetheme{upb}
\setbeamercovered{transparent}
\usepackage{ragged2e} % besseren Umbruch
\usepackage{booktabs} % spezielle Tabellen zulassen
\usepackage{textpos}
\setbeamertemplate{blocks}[rounded][shadow=true]
\setbeamertemplate{title page}[rounded=true,shadow=true]
\title{Title}
\subtitle{Subtitle}
\author{phx}
\institute{University of Paderborn}
\begin{document}
 \frame{\titlepage}
\end{document}

The theme upd is available here (zip-file)

Answer 1

Please provide a full minimal example. Based on the information that you wish a style like Darmstard you use the definition of Darmstadt:

\setbeamercolor*{title}{use=structure,fg=white,bg=structure.fg}
\setbeamertemplate{title page}[default][colsep=-4bp,rounded=true,shadow=true]

Full example without the unknown theme upd

\documentclass[handout]{beamer} % handout 
\usepackage[utf8]{inputenc}
%\usetheme{upb}
\setbeamerfont{block title}{size={}}
\setbeamercovered{transparent}
\usepackage{ragged2e} % besseren Umbruch
\usepackage{booktabs} % spezielle Tabellen zulassen
\usepackage{textpos}
\setbeamertemplate{blocks}[rounded][shadow=true]
\setbeamercolor*{title}{use=structure,fg=white,bg=structure.fg,}
\setbeamertemplate{title page}[default][colsep=-4bp,rounded=true,shadow=true]

\title{Title}
\subtitle{Subtitle}
\author{phx}
\institute{University of Paderborn}
\begin{document}
 \frame{\titlepage}
\end{document}

Result with the usage of the theme upd: