Port Applications From ExtGWT to Vaadin

Hi All ,
I am searching an Ajax framework to port existing EXTGWT applications ,

I just want to learn , can i port every part of those applications to VAADIN ,
Applications has several gwt-extjs components , flash charts , paging grids , etc…
I did not see any examples related to charting or paging grids ,

Is there any suggestions ? ,

Thanks to All ,