wpf border 边框不同颜色

E:\wangxiang\vs2012project\TestBorder\TestBorder\bin\Debug\TestBorder.exe.config E:\wangxiang\vs2012project\TestBorder\TestBorder\bin\Debug\TestBorder.exe E:\wangxiang\vs2012project\TestBorder\TestBorder\bin\Debug\TestBorder.pdb E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\TestBorder.csprojResolveAssemblyReference.cache E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\MainWindow.g.cs E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\App.g.cs E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\GeneratedInternalTypeHelper.g.cs E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\TestBorder_MarkupCompile.cache E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\TestBorder_MarkupCompile.lref E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\MainWindow.baml E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\TestBorder.g.resources E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\TestBorder.Properties.Resources.resources E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\TestBorder.csproj.GenerateResource.Cache E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\TestBorder.exe E:\wangxiang\vs2012project\TestBorder\TestBorder\obj\Debug\TestBorder.pdb