Cannot access x:Key property in Border element

Hi !

  I'm testing an application where I need to check a colour on a specific element. Using Snoop I can see that I need to get to Background property of Border Element (see attached BorderBackground.png) . When I delve into the Background I can see that the element I need is x:Key of the LinearGradientBrush (see attacheched BackgroundLinearGradientBrush.png

  Unfortunately I'm unable to find the x:Key property using TestComplete ObjectBrowser or ObjectSpy. Does anybody have any idea how to access the x:Key property in TextComplete? 

  Please help!

      YuriK