Sub tab (Minerals, Artifacts, Planet Info) selection persists between the trade and planets tab

Repro steps:
1. Click Trade tab
2. Click Artifacts sub tab
3. Click Planets tab
4. Click a specific planet to bring up planet info

Notice: Colony sub tab is selected rather than Resources sub tab.

5. Select Structures sub tab
6. Select Trade tab

Notice: Special sub tab is selected rather than Minerals sub tab.


Possible Solution 1: Make separate SelectedSubTab properties for the Planets and Trade tabs, that way tab selection can persist independently within the two tabs.

Possible Solution 2: When a tab that contains sub tabs is selected, reset the SelectedSubTab property to default value.

Aha! Someone noticed. Yes, currently it overrides the same cookie settings for a global tab setting. I hope to 'namespace' this eventually.