I'm trying to make a ControlContainerTool to behave like a Gallery object of Microsoft Word where it springs in and out when the form is resized.
The Spring property doesn't seem to do anything.
The Spring property is only used when the ControlContainerTools are stacked 2 or 3 tools high in the ribbon (when they are not large sized tools) and the right edges of the controls do not align. If Spring is True, the tools will expand to align their right edge with the widest tool. There is currently no way to have a tool (and therefore it's ribbon group) take up extra space when available. You can submit a feature request for this.