What's actually wanted here is to change item names used inside widgets when the user clicks on a pump. So the popup opened when the user clicks on the pump widget should use all of the items specific to that pump. For this the popup has to be put inside a composite widget and placeholders have to be used. Then when the user clicks on the pump the UI Action "composite-placeholders" is used to modify the item names used in the widgets in the popup for the specific pump, then the popup will be opened by the UI Action "popup-menu". I have attached a working demo that illustrates this. This works best if all of your items only differ in a single part of the item, like "pump[4].speed" - then a single placeholder for replacing the offset would be sufficient as shown in the demo.
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