I managed to build a workaround until the percentage width is supported by Sencha Touch.
Link to Blogpost:
After many feedbacks and questions to the content which was not automatically adjusted I decided to give you an idea how to do this. I had exams last month so I did not have time until now, sorry for this.
Feedbacks would be nice!
Old Post: http://www.sencha.com/forum/showthre...th-for-columns