Restricting Action on Multi select.

Hi All, Is there any way to restrict an action menu on multiselect of the item grid. I found this article for restricting the built in actions such as "save as" , "lock" etc based on the identity. However I want to be able to disable/hide a custom  action on multi select of the grid. Any idea on how I could acheive this functionality would be of great help . Thanks :)
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