2 files changed, 6 insertions, 1 deletions
diff --git a/chrome/views/controls/button/native_button_win.cc b/chrome/views/controls/button/native_button_win.cc
index a6cf075..5a254ac 100644
--- a/chrome/views/controls/button/native_button_win.cc
+++ b/chrome/views/controls/button/native_button_win.cc
@@ -160,7 +160,8 @@ bool NativeCheckboxWin::OnKeyDown(int vkey) {
 bool NativeCheckboxWin::ProcessMessage(UINT message, WPARAM w_param,
                                        LPARAM l_param, LRESULT* result) {
   if (message == WM_COMMAND && HIWORD(w_param) == BN_CLICKED) {
-    checkbox_->SetChecked(!checkbox_->checked());
+    if (!IsRadioButton() || !checkbox_->checked())
+      checkbox_->SetChecked(!checkbox_->checked());
     // Fall through to the NativeButtonWin's handler, which will send the
     // clicked notification to the listener...
   }
diff --git a/chrome/views/controls/button/native_button_win.h b/chrome/views/controls/button/native_button_win.h
index f9dbcaf..ce1cc75e 100644
--- a/chrome/views/controls/button/native_button_win.h
+++ b/chrome/views/controls/button/native_button_win.h
@@ -75,6 +75,9 @@ class NativeCheckboxWin : public NativeButtonWin {
   virtual void NativeControlCreated(HWND control_hwnd);
   virtual bool IsCheckbox() const { return true; }
 
+  // Returns true if this button is actually a radio button.
+  virtual bool IsRadioButton() const { return false; }
+
  private:
   // The Checkbox we are bound to.
   Checkbox* checkbox_;
@@ -91,6 +94,7 @@ class NativeRadioButtonWin : public NativeCheckboxWin {
  protected:
   // Overridden from NativeCheckboxWin:
   virtual void CreateNativeControl();
+  virtual bool IsRadioButton() const { return true; }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NativeRadioButtonWin);