wpf themes make problems

[Feras Mazen Taleb]

hello I used Wpf.Themes library from CodePlex in My Application When I apply a theme every thing works well except that when I open a new Window It appear empty for the first time !!!!!!!! without any control until I move the window to other position in screen the window Update its Layout why's that I watched the OutPut Window and Found the Exception that thrown to the Application and Iused to write it to the Application Output . what ever this is the Exception and its inner Exception could you tell how can I solve it or any usefull link

Error : Cannot animate the 'Visibility'
property on a 'System.Windows.Controls.Border'
using a 'System.Windows.Media.Animation.ObjectAnimationUsingKeyFrames'.
For details see the inner exception.

--Inner : The animation(s) applied to the 'Visibility' 
	  property calculate a current value of 'Visible', 
              which is not a valid value for the property.

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