The first line of code you have provided is valid and works fine for me. Just one note -- can you confirm it is used in PreRender event handler and not in PrePaint? The PrePaint event is fired when the chart layout calculation has been already completed. That is -- the chart title size is calculated according to its current content, so changing it at this point will not be reflected. So you might experience this issue with PrePaint, but it should be fine in PreRender.
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It seems to work correctly on our end. Please, find attached a simple example along with the result. Can you provide us with with an example reproducing the problem? Thanks.
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