Hello Roberto Pantalena,
I was not able to reproduce the problem that you have described. How do you customize the style for the GridViewToggleButton?
The way I do it is the following:
I have created a style for the HierarchyExpandButton. In this style I set the PresentationMode property of GridViewToggleButton to PlusMinus.
Then I apply the style:
I do not loose it when the rows go offscreen.
How is your approach different from mine?
All the best,
the Telerik team
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