Sort data after adding to time-picker control

[kbiesbrock]

When data is unsorted, the control does not render properly. Before we compute any rendering properties, we need to ensure the data is sorted. This is best accomplished in endChanges() so we are only sorting once after items have been added.

[itadapter]

@kbiesbrock please do not auto close anything until we TEST IT, only then we will mark this as resolved