reorganize the sample splitting it in two source files and an additional header;...

reorganize the sample splitting it in two source files and an additional header; most important: don't tile all the controls into the main frame: it becomes too big; rather use a notebook control to properly layout them

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59316 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775