Weird 'IsFloating' error at AnchorablePane creation

[PierrePlaziat]

Hello

I have this problem:

as you can see each time i make a new tool panel procedurally (or also by xaml)
I get those weird errors about the IsFloating property, that i cant get rid of.

They dont alter the app experience but its anoying nonetheless.
Have you some got some info about this?

(Edit: i'm using the nuget package if its relevant)

[PierrePlaziat]

This is caused by the expression theme.

If i use the VS2013 theme i get only one error first time i open a pane:

System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=Fill; DataItem=null; target element is 'GeometryDrawing' (HashCode=59286834); target property is 'Brush' (type 'Brush')