WPF Page Resource not found; error

[esatis]

Hi, 

when using WPF Page inside of Revit, I get a ton of errors like these: 

System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='BrowserActiveTabNormalBackgroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='BrowserUnactiveTabNormalBackgroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='ClientAreaForegroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='BrowserActiveTabNormalBackgroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='BrowserUnactiveTabNormalBackgroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='ClientAreaForegroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='ClientAreaBackgroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='CanvasActiveTabNormalBackgroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='CanvasUnactiveTabNormalBackgroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='ClientAreaForegroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='CanvasActiveTabNormalBackgroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='DockWindowButtonNormalForegroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='DockWindowButtonNormalForegroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='DockWindowButtonNormalForegroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='DockWindowButtonNormalForegroundBrush'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='BrowserActiveTabNormalBackgroundBrush'
E.T.C... 

Even if I add CustomResourceDictionary.xaml, I get the same errors.

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
	<SolidColorBrush x:Key="BrowserActiveTabNormalBackgroundBrush" Color="#FFCCCCCC"/>
	<SolidColorBrush x:Key="BrowserUnactiveTabNormalBackgroundBrush" Color="#FFE5E5E5"/>
	<SolidColorBrush x:Key="ClientAreaForegroundBrush" Color="#FF000000"/>
	<SolidColorBrush x:Key="ClientAreaBackgroundBrush" Color="#FFFFFFFF"/>
	<SolidColorBrush x:Key="CanvasActiveTabNormalBackgroundBrush" Color="#FFDDDDDD"/>
	<SolidColorBrush x:Key="CanvasUnactiveTabNormalBackgroundBrush" Color="#FFEEEEEE"/>
	<SolidColorBrush x:Key="DockWindowButtonNormalForegroundBrush" Color="#FF444444"/>
</ResourceDictionary>

The WPF Dockable page works as expected and all the styling is as set in my pages xaml.
What could be the cause of these errors? 

[jeremy_tammik · Accepted solution]

Why do you call them errors? They are marked as warnings. You can probably simply ignore them. You say everything works as expected, and warnings can be ignored.

[nice3point · Accepted solution]

This is normal behaviour, if in runtime you see these colors, as Jeremy said just ignore. In case of errors you will just get exceptions

[jw.vanasselt]

Is there a way to disable this warnings?
I read in many different forums that this affect the debug performance