Contextual gadgets are pretty limited. If you want to get started in Gmail the best way I recommend is to use James Yu's excellent Gmailr (https://github.com/ja

Contextual gadgets are pretty limited. If you want to get started in Gmail the best way I recommend is to use James Yu's excellent Gmailr (https://github.com/jamesyu/gmailr https://github.com/jamesyu/gmailr). We did some prototyping with that. Since then we've taken that core code and rewrote 90% of it to fit our needs and make our own platform.