How do I filter a subform based on a chosen record in a different subform?

I have two subforms on a main form, "subfrm_Contacts" and "subfrm_Categories".  Both of them are in datasheet view.  "subfrm_Contacts" has as its record source a table, "tbl_Contacts", that contains, among other fields, an integer field called "IdCategory".  "subfrm_Categories" has as its record source a table, "tbl_Categories," with two fields:" IdCategory", an autonumber field, and "CategoryName", a text field.  "subfrm_Categories" only shows the text field which is a list of category names.  

I would like to create an event where when I click on a category name in the "subfrm_Categories",  "subfrm_Contacts" gets filtered to show only the records where tbl_Contacts.IdCategory = tbl_Categories.IdCategory.  What is the best way to do this?
SaleveAsked:
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Rey Obrero (Capricorn1)Commented:
it will be easier if you can post a copy of your db.
for the meantime see this link for reference

Refer to Form and Subform properties and controls
SaleveAuthor Commented:
Here it is.  Form "Main" has the two sub forms discussed above.  I would like to select a value in the "category" subform and have the "contacts" subform filter to only show the records in that category.
Contacts.accdb
PatHartmanCommented:
In the Master/Child links of sfrmB, refer to sfrmA as the "Master"

Master:sfrmA.Category
Child:Category

Then in the Current event of sfrmA, requery sfrmB
Me.Parent!sfrmB.Requery
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Rey Obrero (Capricorn1)Commented:
try this
Contacts.accdb

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SaleveAuthor Commented:
I don't see how I can link two subforms with a master/child relationship.   Would you please explain?  Thanks.
SaleveAuthor Commented:
Thanks Rey!  I will take a look at what you did, but it clearly works!
Rey Obrero (Capricorn1)Commented:
look at the click event of category textbox
SaleveAuthor Commented:
Yes, I see.  Very nice!  Thanks again.
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