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The function isGroupFooter and isGroupHeader in Model class aren't in the documentation and in the TS file.
We have lots and lots of private members, not everything you find in our classes is intended for customer use. Do you have a use case for those methods?
I have a rendering function on a grid that uses registry information to color the lines, and when I turned on the grouping, it started to give error that my properties did not exist. Debugging I checked that the isGroupHeader property was true. I put an if, checking if this property was false, to work my implementation.
Can you please share your code that didn't work unless using isGroupHeader?
Strange, in my implementation the record I receive in the renderer event does not have the properties of my model, just the property I set up in the grouping. But that doesn't happen in your examples if I implement an equal situation.
Ok if you can share some code we can take a look.