Steps to Reproduce

1. run the attached example charts-datetime-with-model.zul
2. click the button to add another value dynamically

Current Result

1. the datetime axis is displayed using milliseconds instead of the correct dates values and also the different intervals between the dates are not reflected

2. the x-axis gets scaled completely incorrect

Expected Result

correctly rendered datetime axis and correct intervals between the value points
(same as using the workaround - setting the model after adding the data values)

Debug Info

this happens when setting the model to the chart after adding the values

Workaround

assign the model before adding values to it
(commented out in the attached example)