Added wxPGProperty::SetDefaultValue(v), as a shortcut for SetAttribute(DefaultValue, v)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60828 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/propgrid/propgrid.cpp

@@ -195,6 +195,7 @@ wxPGGlobalVarsClass::wxPGGlobalVarsClass()
     m_strlong = wxS("long");
     m_strbool = wxS("bool");
     m_strlist = wxS("list");
+    m_strDefaultValue = wxS("DefaultValue");
     m_strMin = wxS("Min");
     m_strMax = wxS("Max");
     m_strUnits = wxS("Units");