wxSlider event handling as described by Vadim in thread 'Slider events' at wx-dev. More changes towards wxRadioBox on Palm.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31852 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/palmos/radiobut.h

@@ -51,6 +51,7 @@ public:
 
     // implementation only from now on
     virtual void Command(wxCommandEvent& event);
+    void SetGroup(uint8_t group);
 
     // send a notification event, return true if processed
     bool SendClickEvent();
@@ -66,6 +67,8 @@ private:
     // common part of all ctors
     void Init();
 
+    uint8_t m_groupID;
+
     // pushButtonCtl or checkboxCtl
     ControlStyleType m_radioStyle;
     DECLARE_DYNAMIC_CLASS_NO_COPY(wxRadioButton)