Unfortunately, the approach discussed in the current thread is no longer available for print previewing hierarchical RadGridView as advised in the following thread - RadGridView Print and Print Preview
. I need to inform you that there is no out of the box implementation that you can use in order to achieve the desired behavior and you will need to come up with a custom logic from your side. I suggest you review the following demo - RadGridView Export and Print through RadDocument - which you can find in our demo application - http://demos.telerik.com/wpf/
I have created a sample project, based on the demo, that implements some custom logic on exporting the expanded child grids, however, the approach is not generic and I am sending it just for your reference. Once you have reviewed it you can consider implementing something similar in your project.
If you have any further questions or concerns, do not hesitate to contact us.
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