Add missing import in BKShowcaseController.j

AppKit/Themes/BlendKit/BKShowcaseController.j

@@ -20,8 +20,18 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+@import <Foundation/Foundation.j>
+@import <AppKit/CPCollectionView.j>
+@import <AppKit/CPColorPanel.j>
+@import <AppKit/CPScrollView.j>
+@import <AppKit/CPSplitView.j>
 @import <AppKit/CPTheme.j>
+@import <AppKit/CPToolbar.j>
 @import <AppKit/CPView.j>
+@import <AppKit/CPWindow.j>
+
+@import "BKThemeDescriptor.j"
+
 
 
 var LEFT_PANEL_WIDTH    = 176.0;