What I have done in the past is create a text box or label (don't remember) that the background is set to NOT transparent. Then I set the visible property to false. In the Detail_Format event check your condition and if it's less than 1 set the visible property of the text box to true. Make sure that the text box covers any other controls that you have so that they appear hidden when the text box is visible.
I included those brackets as they are exactly how the error message was displayed.
The answer to my original problem is this.
1. Create a small text box. Delete the text box label.
2. Place the text box in left most section of the detail records. Format font & field size to match detail records.
3. Select the text box and then "Properties"
4. Control source set to: =1
5. Format: General Number
6. Decimal Places: 0
7. Running Sum: Over All