WPF finishing-XAML access to static attributes

"XAML provides an easy way to set values of properties-Type convertersAndExtended property syntaxAllow for flexible setting of values. However, some things cannot be expressed as a simple value, such as setting a property to the value of some static property ."

This is relatively simple, just know, the code snip is as follows:

     <  Stackpanel  >          <  Ellipse  Stroke  = "Black"  Height  = "50"  Fill ="  {X: static systemcolors. Comment topbrush}  "  />          <  Rectangle  Stroke  = "Black"  Height  = "50"  Fill  ="  {X: static systemcolors. activecaptionbrush}  "  />      </ Stackpanel  > 

Please compare:WPF finishing-use the color and font of the selected topic.