How To enable ZOOM button In Oracle Apps

By default, the ZOOM button is in disabled mode.We need to do modifications in the CUSTOM.pll .
How To enable ZOOM trigger In Oracle Apps, askhareesh blog for Oracle Apps

I would like to enable this zoom button in the purchase orders form, when cursor is in Market Price Item in Price Reference tab only. For this, we need to know form name, block name and item name.
To know the form name:
Open form --> Navigation: Purchasing Vision Operations --> Purchase Orders --> Purchase Orders
Help menu --> About Oracle Applications
How To enable ZOOM trigger In Oracle Apps, askhareesh blog for Oracle Apps
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