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In the ptc-windchill-extension-1.0.0-14.zip archive there is an extension called infotableselector_ExtensionPackage.zip . This extension enables the use of the Widget called Infotable Selector, which can be used to clear the selection in a grid.
For how to use this widget, take a look at the picture:
Where can I download this extension?
you can download it from ptc marketplace. It's called PTC Windchill Extension.