how to define static resource for background color of wpf?

Question

hi all,

im writing LinearGradientBrush code in window.resource like below

<Window.Resources>

<LinearGradientBrush x:Key="cbColor">

<GradientStop Offset="0" Color="Red"></GradientStop>

<GradientStop Offset="0.5" Color="Silver"></GradientStop>

<GradientStop Offset="1" Color="Green"></GradientStop>

</LinearGradientBrush>

</Window.Resources>

and using this as a background of window as a static resource but it is giving some error.

and if am using it as a dynamic resource it working fine,im confused why it is not working with static resource as i am writing it only in window xaml code