Is there a page event when a layout cycle has completed?

Hi,
I have a custom cell that contains a grid with 2 columns, I want to get the width of the first column once the layout cycle has completed, but before the page is displayed. The OnAppearing method in iOS gets called after the page is displayed, not before (at least in 1.4.1). I cannot see a page event or method I can override that will accomplish this, any suggestions?

Thanks
John