added sample 30-1, a tip of COLORS, into 00516

README.mdown

@@ -36,7 +36,7 @@ Table of contents
 	- [00513 Shoes.setup (sample27.rb, sample50.rb)](http://github.com/ashbb/shoes_tutorial_html/tree/master/mdowns/00513_Shoes.setup.mdown)
 	- [00514 Downloader (sample28.rb)](http://github.com/ashbb/shoes_tutorial_html/tree/master/mdowns/00514_Downloader.mdown)
 	- [00515 Assign Shoes URL dynamically (sample29.rb)](http://github.com/ashbb/shoes_tutorial_html/tree/master/mdowns/00515_Assign_Shoes_URL_dynamically.mdown)
-	- [00516 Classes List and Colors List (sample30.rb)](http://github.com/ashbb/shoes_tutorial_html/tree/master/mdowns/00516_Classes_List_and_Colors_List.mdown)
+	- [00516 Classes List and Colors List (sample30.rb, sample30-1.rb)](http://github.com/ashbb/shoes_tutorial_html/tree/master/mdowns/00516_Classes_List_and_Colors_List.mdown)
 	- [00517 start, stop and restart (sample31.rb)](http://github.com/ashbb/shoes_tutorial_html/tree/master/mdowns/00517_start,_stop_and_restart.mdown)
 	- [00518 Combination of image objects show/hide and mouse hover/leave (sample32.rb, sample33.rb, sample34.rb)](http://github.com/ashbb/shoes_tutorial_html/tree/master/mdowns/00518_Combination_of_image_objects_show_hide_and_mouse_hover_leave.mdown)
 	- [00519 arc and cap (sample35.rb)](http://github.com/ashbb/shoes_tutorial_html/tree/master/mdowns/00519_arc_and_cap.mdown)

changelog.mdown

@@ -1,6 +1,6 @@
 Change log:
 -----------
-Feb 16th, 2009: Merged citizen428's pull requests edited 00501 to 00505. <br>
+Feb 16th, 2009: Merged citizen428's pull requests edited 00501 to 00505 and added sample 30-1, a tip of COLORS, into 00516. <br>
 Feb 12th, 2009: Merged citizen428's pull requests edited 00300 to 00410. <br>
 Feb 10th, 2009: Clarified link to installation instructions in chapter 00200. <br>
 Feb 10th, 2009: Minor additions and corrections to chapter 00100. <br>

mdowns/00516_Classes_List_and_Colors_List.mdown

@@ -24,3 +24,26 @@ We can also see them with the following sample code. <br>
 \_why is thinking about some more method related colors. <br>
 e.g.  invert, dark?, light?, black?, white?, opaque?, transparent? <br>
 We might be able to get them in the near future. <br>
+
+
+Note
+----
+I used send() method in the above sample30. But I noticed an alternative way. See the below sample30-1.
+
+	# sample30-1.rb
+	Shoes.app :width => 642, :height => 700, :resizable => false do
+	  COLORS.sort_by{|sym,| sym.to_s}.each do |color, v|
+	    flow :width => 160, :height => 20 do
+	      fill v
+	      rect 0, 0, 160, 20
+	      inscription color, :stroke => v.dark? ? white : black
+	    end
+	  end
+	end
+
+**NOTE**: There is no need to use `.to_s` in the map or sort\_by method's block by right. But with Shoes 2, the below error will occur if it's ommited. I guess this is a bug of Shoes...
+
+**sample30-1.png**
+
+![sample30-1.png](http://github.com/ashbb/shoes_tutorial_html/raw/master/images/sample30-1.png)
+

src/sample30-1.rb

@@ -0,0 +1,10 @@
+# sample30-1.rb
+Shoes.app :width => 642, :height => 700, :resizable => false do
+  COLORS.sort_by{|sym,| sym.to_s}.each do |color, v|
+    flow :width => 160, :height => 20 do
+      fill v
+      rect 0, 0, 160, 20
+      inscription color, :stroke => v.dark? ? white : black
+    end
+  end
+end