Added wxPropertyGrid::SetUnspecifiedValueAppearance(); Added wxPGEditor::SetControlAppearance() for applying wxPGCell attributes on a property editor.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62973 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/propgrid/propgrid.h

@@ -740,6 +740,13 @@ public:
     */
     wxTextCtrl* GetEditorTextCtrl() const;
 
+    /**
+        Returns current appearance of unspecified value cells.
+
+        @see SetUnspecifiedValueAppearance()
+    */
+    const wxPGCell& GetUnspecifiedValueAppearance() const;
+
     /**
         Returns (visual) text representation of the unspecified
         property value.
@@ -981,6 +988,19 @@ public:
     */
     void SetSplitterLeft( bool privateChildrenToo = false );
 
+    /**
+        Sets appearance of value cells representing an unspecified property
+        value. Default appearance is blank.
+
+        @remarks If you set the unspecified value to have any
+                 textual representation, then that will override
+                 "InlineHelp" attribute.
+
+        @see wxPGProperty::SetValueToUnspecified(),
+             wxPGProperty::IsValueUnspecified()
+    */
+    void SetUnspecifiedValueAppearance( const wxPGCell& cell );
+
     /**
         Sets vertical spacing. Can be 1, 2, or 3 - a value relative to font
         height. Value of 2 should be default on most platforms.