1 files changed, 30 insertions, 0 deletions
diff --git a/ruby_1_8_5/ext/tk/sample/propagate.rb b/ruby_1_8_5/ext/tk/sample/propagate.rb
new file mode 100644
index 0000000000..800cef553d
--- /dev/null
+++ b/ruby_1_8_5/ext/tk/sample/propagate.rb
@@ -0,0 +1,30 @@
+#!/usr/bin/env ruby
+require 'tk'
+
+TkLabel.new(:text=>"Please click the bottom frame").pack
+
+f = TkFrame.new(:width=>400, :height=>100, :background=>'yellow', 
+                :relief=>'ridge', :borderwidth=>5).pack
+
+# TkPack.propagate(f, false) # <== important!!
+f.pack_propagate(false)      # <== important!!
+
+list = (1..3).collect{|n|
+  TkButton.new(f, :text=>"button#{'-X'*n}"){
+    command proc{
+      puts "button#{'-X'*n}"
+      self.unpack
+    }
+  }
+}
+
+list.unshift(nil)
+
+f.bind('1', proc{
+         w = list.shift
+         w.unpack if w
+         list.push(w)
+         list[0].pack(:expand=>true, :anchor=>:center) if list[0]
+       })
+
+Tk.mainloop