If you take a look at http://www.texample.net/tikz/examples/boxes-with-text-and-math/ the boxes there are with rounded corners. In the examples, both the box itself and the title is a box. I want the title box to not have the bottom corners rounded.
On page 120 in the manual, there is a description of how to draw with and without rounded corners. However, I want to use this in a fancytitle. It looks a bit silly to have the fancytitle as a box where all corners are rounded when it is as wide as the box itself.
\begin{tikzpicture}[baseline=-2cm]
\node [mybox] (box){
\begin{minipage}[t!]{0.50\textwidth}
Help, I'm a box
\end{minipage}
};
\node[fancytitle, text width=0.5423\textwidth, text centered, rounded corners] at (box.north) {Help, I'm a title};
\end{tikzpicture}
The style I use is this
\tikzstyle{mybox} = [draw=red, fill=blue!20, very thick,
rectangle, rounded corners, inner sep=10pt, inner ysep=20pt]
\tikzstyle{fancytitle} = [fill=red, text=white]