FindColumnTitle
BColumnTitle* title = FindColumnTitle(where);
BColumnTitle* overTitle = overTitleView ? fTitleView->FindColumnTitle(where) : 0;
fTitle = fTitleView->FindColumnTitle(column);
fTitle = fTitleView->FindColumnTitle(column);
BColumnTitle* FindColumnTitle(BPoint) const;
BColumnTitle* FindColumnTitle(const BColumn*) const;