Zooming in or out can be achieved by modifying the RadGanttView PixelLength
We have an example in our WPF Demos showing how to do that - you can download the examples from this link
, once they are installed go to the GanttView First Look
demo. There we use a RadSlider to modify the RadGanttView PixelLength and achieve zooming in/out the TimeRuler Part.
I hope this will help.
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