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diff --git a/library/ttk/button.tcl b/library/ttk/button.tcl
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+#
+# Bindings for Buttons, Checkbuttons, and Radiobuttons.
+#
+# Notes: <Button1-Leave>, <Button1-Enter> only control the "pressed"
+# state; widgets remain "active" if the pointer is dragged out.
+# This doesn't seem to be conventional, but it's a nice way
+# to provide extra feedback while the grab is active.
+# (If the button is released off the widget, the grab deactivates and
+# we get a <Leave> event then, which turns off the "active" state)
+#
+# Normally, <ButtonRelease> and <ButtonN-Enter/Leave> events are 
+# delivered to the widget which received the initial <ButtonPress>
+# event.  However, Tk [grab]s (#1223103) and menu interactions
+# (#1222605) can interfere with this.  To guard against spurious
+# <Button1-Enter> events, the <Button1-Enter> binding only sets
+# the pressed state if the button is currently active.
+#
+
+namespace eval ttk::button {}
+
+bind TButton <Enter> 		{ %W instate !disabled {%W state active} }
+bind TButton <Leave>		{ %W state !active }
+bind TButton <Key-space>	{ ttk::button::activate %W }
+bind TButton <<Invoke>> 	{ ttk::button::activate %W }
+
+bind TButton <ButtonPress-1> \
+    { %W instate !disabled { ttk::clickToFocus %W; %W state pressed } }
+bind TButton <ButtonRelease-1> \
+    { %W instate pressed { %W state !pressed; %W instate !disabled { %W invoke } } }
+bind TButton <Button1-Leave> \
+    { %W state !pressed }
+bind TButton <Button1-Enter> \
+    { %W instate {active !disabled} { %W state pressed } }
+
+# Checkbuttons and Radiobuttons have the same bindings as Buttons:
+#
+ttk::copyBindings TButton TCheckbutton
+ttk::copyBindings TButton TRadiobutton
+
+# ...plus a few more:
+
+bind TRadiobutton <KeyPress-Up> 	{ ttk::button::RadioTraverse %W -1 }
+bind TRadiobutton <KeyPress-Down> 	{ ttk::button::RadioTraverse %W +1 }
+
+# bind TCheckbutton <KeyPress-plus> { %W select }
+# bind TCheckbutton <KeyPress-minus> { %W deselect }
+
+# activate --
+#	Simulate a button press: temporarily set the state to 'pressed',
+#	then invoke the button.
+#
+proc ttk::button::activate {w} {
+    $w instate disabled { return }
+    set oldState [$w state pressed]
+    update idletasks; after 100	;# block event loop to avoid reentrancy
+    $w state $oldState
+    $w invoke
+}
+
+# RadioTraverse -- up/down keyboard traversal for radiobutton groups.
+# 	Set focus to previous/next radiobutton in a group.
+#	A radiobutton group consists of all the radiobuttons with
+#	the same parent and -variable; this is a pretty good heuristic
+#	that works most of the time.
+#
+proc ttk::button::RadioTraverse {w dir} {
+    set group [list]
+    foreach sibling [winfo children [winfo parent $w]] {
+    	if {   [winfo class $sibling] eq "TRadiobutton"
+	    && [$sibling cget -variable] eq [$w cget -variable]
+	    && ![$sibling instate disabled]
+	} {
+	   lappend group $sibling
+	}
+    }
+
+    if {![llength $group]} {	 # Shouldn't happen, but can.
+    	return
+    }
+
+    set pos [expr {([lsearch -exact $group $w] + $dir) % [llength $group]}]
+    tk::TabToWindow [lindex $group $pos]
+}