When TabGroupPane is hosted in the DocumentContentHost the tabs look different, where is this default style found inside of the default style templates?
The tab items are instances of the PaneTabItem class. The default style conditionally sets the Template property to different values depending on the location.
If you search for PaneTabItem you will find the default style(s). If you search for those keys listed above then you will find the default templates.
So if i started a brand new project and added some Tabs in the DockManager document and wanted to change these what are the steps i should take?
In your samples "DocumentContentHost" has a "SplitPane" that hosts a "TabGroupPane" and contains the view i created itself within "ContentPane". When i search though for "PaneTabItem.DocumentTabItemTemplateKey" i find that its part of the template for something called a "PaneTabItem" so im a bit confused.