title: wpf toolkit datetimepicker how to change color of spinner
body: <p>How can I change the color of the spinner-arrows for the DateTimePicker from xceed WPF Toolkit?
  I cant find a Property where the set the color for the arrows.<br>
  Do i need to override the whole ButtonSpinner to do so?<br>
  If yes how can I do that, I still a beginner at WPF and if I simply try to copy the sourcecode from the <a href="http://wpftoolkit.codeplex.com/SourceControl/latest#Main/Source/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/ButtonSpinner/Themes/Generic.xaml" rel="nofollow">ButtonSpinner reference page</a> Visual Studio complains that the term "ResourceKeys does not exist in the namespace" of themes</p>