Chart.js do not display in Boostrap tabpanel

info here http://getbootstrap.com/javascript/#tabs

use something like this

$('a[data-toggle="tab"]').on('shown.bs.tab', function (e) {
  // here redraw your chart
})

UPD: make demo for you http://jsfiddle.net/serGlazkov/291w2jLk/145/