>How can I change the text do red when the value is negative ?
There are some "Dynamic" properties, such as DynamicForeColor, DynamicBackColor, etc., which you can use for conditional formatting.
Usage would be something like this: DynamicForeColor = iif(..., rgb(...), rgb(...))
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)