When I am on sub-subpage is there a way, that I can still show the subpage1 (which is above) & subpage 2 (which is below) in its current form?
I attached a screenshot of the page structire that I have. The screenshot shows that all items are visible. the parent items could be hidden if you explicitly do it somehow in the code. By default you should see them.
In your example, where would I go to make that update? Would it effect every sitepanel that I build?
This is a public property and it will be accessible form the property designer of the control. If there is nothing set for this property the control will function as is, otherwise the binding will start from the SiteMapNode you have selected.
Also, is there a setting so that when I am on subpage 1 and I go to subpage 2 it will collapse the subpage 1?
This is default behavior of the RadPanelBar control. You could take a look at the attached video. Most probably you have set some properties or you have a code that breaks the collapsing.
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