Hello Jack,
Your request makes sense in this case, but there are scenarios in which the desired behavior will cause side effects, for example if you set a width style via the button's attributes, it will be applied to the arrow element as well, which is not needed.
I recommend you to add the k-primary class to the arrow element with Javascript after the Toolbar is initialized:
On the other hand, CSS styles that need to be targeted at the whole split button (i.e. the split button's wrapper), can be applied via the buttons ID, e.g. #user-toolbar-view.
Regards,
Dimo
Telerik
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