Updated documentation for some wxPropertyGrid classes.

Updated documentation for wxPGEditor, wxPropertyGridPage, wxPropertyGridManager, wx*Property classes.
Removed doxygen-style comments from header files.

interface/wx/propgrid/propgridiface.h

@@ -71,6 +71,38 @@ wxPG_SORT_TOP_LEVEL_ONLY          = 0x00000200
 /** @}
 */
 
+/** @section propgrid_misc_data wxPropertyGrid Miscellaneous
+
+    This section describes some miscellaneous values, types and macros.
+    @{
+*/
+
+/**
+    Used to tell wxPGProperty to use label as name as well.
+*/
+#define wxPG_LABEL              (*wxPGProperty::sm_wxPG_LABEL)
+
+/**
+    This is the value placed in wxPGProperty::sm_wxPG_LABEL
+*/
+#define wxPG_LABEL_STRING       wxS("@!")
+
+#define wxPG_COLOUR_BLACK       (*wxBLACK)
+
+/**
+    Convert Red, Green and Blue to a single 32-bit value.
+*/
+#define wxPG_COLOUR(R,G,B) ((wxUint32)(R+(G<<8)+(B<<16)))
+
+/**
+    If property is supposed to have custom-painted image, then returning
+    this in OnMeasureImage() will usually be enough.
+*/
+#define wxPG_DEFAULT_IMAGE_SIZE  wxDefaultSize
+
+/** @}
+*/
+
 /**
     @class wxPropertyGridInterface