I know this question may be stupid, but it has been already struggling me for several days.
as you see, there is a fiducial node in the CTA image.
and I created a standard intial extension, insert a label called ‘lowerpoint’ and a qMRMLNodeCombobox.
I want to use this qMRMLNodeCombobox to choose the fiducial node, but the combobox is gray and can’t to interact with mouse. So, how can I use the combobox to choose the fiducial node?