Forms Personalization in R12 (Zoom screen)

Dear All,

I have the following requirement

When a user searches for an item in a particular item number, there should be a zoom screen for Material on hand for the item.

I have completed the step where in once the item is selected and the user goes to the Tools menu and open the material work bench using forms personalization.

Now my problem is how to pass the item number value in (Organization items form) to Item number in Material work bench and also how to automatically click the Enter button in Material workbench form?

Please help me with this.