I have a sentence like this "पठ् + अ + ति" and I want to add some notes like shown in the attached image. Is there a package for such things or I need to work with Tikz.
Any reference material or help would be appreciated.
============Edited question based on Solution given by Gonzolo =========== Here is MWE and the output I am getting.
\documentclass{article}
\usepackage{fontspec,xltxtra,xunicode}
\usepackage{tikz}
\usetikzlibrary{shapes.callouts}
\setmainfont[Script=Devanagari,AutoFakeBold=3.5]{Sanskrit 2003}
\definecolor{myblue}{RGB}{122,175,234}
\newcommand\tikzmark[1]{%
\tikz[remember picture,overlay]\node (#1) {};}
\newcommand\MyNote[3][]{%
\begin{tikzpicture}[remember picture,overlay]
\node[rectangle callout, fill=myblue,text width=2cm,align=center,font=\sffamily\bfseries\color{white},#1] at #2 {#3};
\end{tikzpicture}%
}
\begin{document}
पठ् \tikzmark{a}\qquad + अ + \tikzmark{b} ति ।
\MyNote[callout relative pointer={(0,1)}]{([yshift=-1.5cm]a)}{क्रिया को धारण करता है वह धातु है ।}
\MyNote[callout relative pointer={(0,1)}]{([yshift=-1.5cm]b)}{"अ \& ति" का कर्ता अर्थ को कह रहा है}
\end{document}