I've not been able to find an example of how to do this, but I have an UltraTree in a GroupStyleContainer group and I would like to be able to resize its group container using the mouse. Can anyone share an example?
The control does not support resizing the control container through the user interface. I have never tried, but it might be possible to do this by starting a drag operation, and increasing/decreasing the value of the group's ContainerHeight property based on the delta between the current mouse position and the point at which the drag was initiated.