When using Modifier, TooltipOverride works fine.

When using BinaryModifier, it's not showing up.

However, this might be related to the use of a new Property within the SiumlationDescriptor referenced by the BinaryModifier.

I've created a GuiElement for the new Property, but it only seems to work if the Property was added to SimulationDescriptors[Empire] and SimulationDescriptors[ColonizedStarSystem] (so far) and not when the Property is apart of something like a system improvement descriptor.

So the question is how to get tooltips to look correct when using a new Property?

So I set up a series of test items to check various permentations of useage... and every single one worked. Hmmm.

What I think is happening on the original ones that don't work, is the local property is set to 0. This property may later be increased, however I think if the BinaryModifier evaluates to 0, the tooltip is suppressed regardless of override.

Since an unbuilt structure must evaluate to 0, therein lies the problem.

I think I found a workaround, though.

I'm instead setting the basevalue to 1, and then adding a Modifier to subtract 1 from the value, making the "normal" value 0 again. This seems to trick it into displaying the tooltip.