I think that they are still button objects, but the resize issue is a pain and has been previously reported. FileMaker, believe it or not, does not consider this to be a bug.
For More Information see:
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: https://www.dropbox.com/s/jt09b82i0xijbu3/FMP%20Bugs.zip