How to view all records from combo box on form

I have a combo box on a form that passes 6 different annex number sets as parameters to the linked query. These numbers are 0600000, 1502000, 1602000, 1700000, and 1800000. The following line works perfect when selecting those numbers individually and after update, subform query gets refreshed and updated. 
[forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop]

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I also need to see all records from the query not just when I select individual annexes, and this is where I am having a problem. Currently this is the code I am using as criteria in the query, but its not returning any records when in the dropbox I select empty option, or even a * option. 
IIf(IsNull([forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop]),"*",[forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop])

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Can anyone help me with what code I need to have these annexes displayed individually and all at the same time?
toalexsandrAsked:
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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
In your query, define a column as:

[forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop]

and include a OR condition of IS Null

This:

IIf(IsNull([forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop]),"*",[forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop])

 Then is not needed.  Just look at the form control for the criteria check on the number.

Jim.
Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
and just to be clear, the SQL will end up as:

<some field> = [forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop]

Or

[forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop]  Is Null

The later resulting in all records.

Jim.

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toalexsandrAuthor Commented:
Thanks for quick response, unfortunately its not working...using expression builder...

[forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop]  Or Is Null

this returns just 2 blank rows and when selecting individual annexes it adds the blank rows....

My combo box has the following list values, " ", 0600000, 1502000, 1602000, 1700000 and 1800000. Maybe instead of blank I need to have something else?
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toalexsandrAuthor Commented:
Maybe this will be easier with VBA code?
Jeffrey CoachmanMIS LiasonCommented:
Check your syntax...

Jim's Post:
[forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop] Or [forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop]  Is Null

Your post:
[forms]![fr_DailyWOMYPInspectionSelection]![cmb_AnnexDrop]  Or Is Null

Try it exactly the way Jim posted it...
toalexsandrAuthor Commented:
Thank you for your help. It worked perfectly. The problem was that I was adding empty line space in my combo box and it was not searching properly.
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