BOptionPopUp: move mennu setup to AttachedToWindow

* There is no need to delay this to AllAttached
* Apps may want to override the SetDivider, and doing it as late as
AllAttached can be annoying.

Fixes #10734.

headers/os/interface/OptionPopUp.h

@@ -40,6 +40,7 @@ public:
 									int32 index);
 
 	virtual	void				AllAttached();
+	virtual	void				AttachedToWindow();
 	virtual	void				MessageReceived(BMessage* message);
 	virtual	void				SetLabel(const char* text);
 	virtual	void				SetValue(int32 value);

src/kits/interface/OptionPopUp.cpp

@@ -184,11 +184,18 @@ BOptionPopUp::AddOptionAt(const char* name, int32 value, int32 index)
 }
 
 
-/*! \brief Called to take special actions when the child views are attached.
+// BeOS R5 compatibility, do not remove
-	It's used to set correctly the divider for the BMenuField.
-*/
 void
 BOptionPopUp::AllAttached()
+{
+	BOptionControl::AllAttached();
+}
+
+
+/*! \brief Sets the divider for the BMenuField and target the menu items to ourselves.
+*/
+void
+BOptionPopUp::AttachedToWindow()
 {
 	BMenu* menu = fMenuField->Menu();
 	if (menu != NULL) {