As of DesignTime Revision 2100 and RunTime Revision 817 Widget To Widget Communication has received additional functionality. This functionality includes widgets communicating their controller events and controls with other widgets and the parent page.
Controllers have been modified to allow them to be marked as public. If a controller is set to public then other widgets and the parent page are able to call that controller. Controller Events are now able call multiple controllers. In addition to widget controllers being public widgets can now create their own events that can be called outside of the widget. Controller events across widgets also allow for parameters to be passed in via static values or dynamically.
HtmlId's in widgets are no longer restricted by the HtmlId's of the parent page. This means users can assign a control in the parent page and a control in the widget the same HtmlId without any issue.
Here is a post detailing a basic use of Widget To Widget Communication.
Widget To Widget Communication Revision
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Widget To Widget Communication Revision
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