# Switching from onecolumn to twocolumn sends to the next page!

I have a simple documentclass with onecolumn title and twocolumn body. When When switching back to twocolumn for the body text, it will goes to the next page instead of continuing under the title:

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{article2}
\newcommand\@ptsize{}

\DeclareOption{letterpaper}
{\setlength\paperheight {11in}%
\setlength\paperwidth  {8.5in}}

\DeclareOption{10pt}{\renewcommand\@ptsize{0}}

\DeclareOption{final}{\setlength\overfullrule{0pt}}
\DeclareOption{onecolumn}{\@twocolumnfalse}
\DeclareOption{twocolumn}{\@twocolumntrue}

\ExecuteOptions{letterpaper,10pt,twocolumn,final}
\ProcessOptions
\input{size1\@ptsize.clo}

\newenvironment{titlex}
{%
\onecolumn
}%
\twocolumn
\endinput

How to switch back to twocolumn by continuing right after the title (in the same page).

UPDATE: My point is how to safely switch from onecolumn to twocolumn and vice versa. An example is putting a long formula in the middle of a two-column text.

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Are you allowed to use multicol? It allows for much easier switching between column formats. –  Werner Apr 17 '12 at 5:20
@Werner multicol is sometimes very useful, but it is also limiting, for example when playing with figures within text. –  All Apr 17 '12 at 6:10