With a list of widgets in a UI framework like Qt or GTK, one can have an HBox or VBox with fixed-size or fixed-ratio widgets and include a variable-size widget to fill any remaining room in the box:
I am creating a Shop (black) with a ScrollingFrame (blue) to show shop items and tabs (red) above the ScrollingFrame for different categories:

The ScrollingFrame has a size of {1,0},{1,0} and a UIAspectRatio so it fills the entire width of the shop. The shop is tall enough that the ScrollingFrame will not fill the entire height. Are there any constraints that can fill the space between the top of the Shop frame and top of the ScrollingFrame? I’ve tried a UIListConstraint but it doesn’t change the size of the tabs Frame.
