The correct way to attach a handler for a client-side event of the splitter using a server-side property is the following:
However, the resized client-side event of the splitter is raised when the splitter itself is resized. And when you move a splitBar, the splitter is not resized - the two panes on each side of the splitBar are resized. That is why, you need to handle the resized event of the panes and not that of the splitter. For example:
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