Silverlight中的颜色管理？

<Grid x:Name="LayoutRoot" Background="#93c9cc"> <Rectangle Width="640" Height="480" <a href="/tag/stroke/" target="_blank" class="keywords">stroke</a>="Gainsboro" <a href="/tag/stroke/" target="_blank" class="keywords">stroke</a>Thick<a href="/tag/nes/" target="_blank" class="keywords">nes</a>s="2" RadiusX="10" RadiusY="10"> <Rectangle.Fill> <ImageB<a href="/tag/rush/" target="_blank" class="keywords">rush</a> x:Name="imgBack" ImageSource="/Images/bg_back.jpg" Opacity="0.6"> </ImageB<a href="/tag/rush/" target="_blank" class="keywords">rush</a>> </Rectangle.Fill> </Rectangle> </Grid>  

 如何在后台中更改页面的颜色及背景图片呢？参考下面的代码？

imgBack.ImageSource = new BitmapImage(new Uri("Images/a.jpg",UriKind.Relative)); LayoutRoot.Background = new SolidColorB<a href="/tag/rush/" target="_blank" class="keywords">rush</a>(Colors.<a href="/tag/bro/" target="_blank" class="keywords">bro</a>wn);

可以更改颜色代码如下：

Color c = new Color(); c.A = 255; c.R = 0; c.G = 0; c.B = 0; SolidColorB<a href="/tag/rush/" target="_blank" class="keywords">rush</a> b<a href="/tag/rush/" target="_blank" class="keywords">rush</a> = new SolidColorB<a href="/tag/rush/" target="_blank" class="keywords">rush</a>(c);

Color c = Colors.Black; SolidColorB<a href="/tag/rush/" target="_blank" class="keywords">rush</a> b<a href="/tag/rush/" target="_blank" class="keywords">rush</a> = new SolidColorB<a href="/tag/rush/" target="_blank" class="keywords">rush</a>(c);

Color c = Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>Colors.ControlColor; SolidColorB<a href="/tag/rush/" target="_blank" class="keywords">rush</a> b<a href="/tag/rush/" target="_blank" class="keywords">rush</a> = new SolidColorB<a href="/tag/rush/" target="_blank" class="keywords">rush</a>(c);

Color c = Color.FromArgb(255,255,255); SolidColorB<a href="/tag/rush/" target="_blank" class="keywords">rush</a> b<a href="/tag/rush/" target="_blank" class="keywords">rush</a> = new SolidColorB<a href="/tag/rush/" target="_blank" class="keywords">rush</a>(c);