Pluggable custom widgets

Is there a way to unpack existing mendix widgets mpks like button, or input textbox widget and see the source code of these and modify them?    UPDATE: Except the case where we unzip mpks. Is there a way to convert the widget to the file structure/framework it was used to be built
1 answers

You can open the MPKs with 7zip or some program alike. There you can see the source of the widget and op the files. You can make changes to them and place them back in  the compressed file