In the _AfterUpdate event of the combo box, manipulate the filter of the form. For example, when 'All Projects" is the selection of the combo box set the filter off (me.form.filteron = false), or when either of the "Validated" cases is selected set the filter to instr(1, Review_Status, "Validated") = 1 (if the 'Validated' always starts in the first character of the value, otherwise use > 0) then set filteron = true.
Not having played with it (and not remembering off the top of my head) you might have to be careful in the case of Null values for Review_status so you might need to use something like instr(1,nz(review_status,""),"Validated).
HTH
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