Accepted answer

The range selector buttons are enabled depending on the x-Axis range. The buttons smaller than the x-Axis minimum range are disabled.

By default the minimum range of the x-Axis is five times the smallest interval between any of the data points.

Changing the x-Axis minimum range to 1 month (in milliseconds, so 28 days approximated) did the trick.

Source: Vaadin Forums

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