I need to find out the number of pages the user has selected in the map series tab of a layout's contents pane. It looks like I have to do this by examining the dock pane in the Pro UI. Any help on how to achieve that? UI coding is not what I normally do.
I already have discovered I can do:
DockPane contentPane = ProApp.DockPaneManager.Find("esri_core_contentsDockPane");
However, DockPane seems pretty opaque. I assume I need to get the "List Map Series Pages" tab and examine the tree displayed to count the number of selected items.
I should add that this really needs to happen behind the scenes, so the state of the Pro UI is not affected.
And I need to support both SpatialMapSeries and BookmarkMapSeries,
TIA for any help.