diff --git a/interface/wx/propgrid/advprops.h b/interface/wx/propgrid/advprops.h
index 38bfa51889..7917df020f 100644
--- a/interface/wx/propgrid/advprops.h
+++ b/interface/wx/propgrid/advprops.h
@@ -95,6 +95,9 @@ public:
     @ingroup classes
     Has dropdown list of wxWidgets system colours. Value used is
     of wxColourPropertyValue type.
+
+    <b>Supported special attributes:</b>
+    ::wxPG_COLOUR_ALLOW_CUSTOM, ::wxPG_COLOUR_HAS_ALPHA
 */
 class wxSystemColourProperty : public wxEnumProperty
 {
@@ -168,6 +171,14 @@ protected:
 
 
 
+/** @class wxColourProperty
+    @ingroup classes
+    Allows to select a colour from the list or with colour dialog. Value used
+    is of wxColourPropertyValue type.
+
+    <b>Supported special attributes:</b>
+    ::wxPG_COLOUR_ALLOW_CUSTOM, ::wxPG_COLOUR_HAS_ALPHA
+*/
 class wxColourProperty : public wxSystemColourProperty
 {
 public:
diff --git a/interface/wx/propgrid/property.h b/interface/wx/propgrid/property.h
index 2cab67c25a..b0748f2601 100644
--- a/interface/wx/propgrid/property.h
+++ b/interface/wx/propgrid/property.h
@@ -206,9 +206,9 @@ struct wxPGPaintData
 */
 #define wxPG_ATTR_MULTICHOICE_USERSTRINGMODE    wxS("UserStringMode")
 
-/** Built-in attribute of wxColourProperty and its kind, type of @c int,
-    default value is 1. Setting this attribute to 0 hides custom colour
-    from property's list of choices.
+/** Built-in attribute of wxColourProperty and its kind, type of @c bool,
+    default value is @true. Setting this attribute to @false hides custom
+    colour from property's list of choices.
 */
 #define wxPG_COLOUR_ALLOW_CUSTOM            wxS("AllowCustom")
 
diff --git a/src/propgrid/advprops.cpp b/src/propgrid/advprops.cpp
index 1d84ae5c9a..852d91790f 100644
--- a/src/propgrid/advprops.cpp
+++ b/src/propgrid/advprops.cpp
@@ -1571,16 +1571,16 @@ bool wxSystemColourProperty::DoSetAttribute( const wxString& name, wxVariant& va
 {
     if ( name == wxPG_COLOUR_ALLOW_CUSTOM )
     {
-        int ival = value.GetLong();
+        bool allow = value.GetBool();
 
-        if ( ival && (m_flags & wxPG_PROP_HIDE_CUSTOM_COLOUR) )
+        if ( allow && (m_flags & wxPG_PROP_HIDE_CUSTOM_COLOUR) )
         {
             // Show custom choice
             /* TRANSLATORS: Custom colour choice entry */
             m_choices.Add(_("Custom"), wxPG_COLOUR_CUSTOM);
             m_flags &= ~(wxPG_PROP_HIDE_CUSTOM_COLOUR);
         }
-        else if ( !ival && !(m_flags & wxPG_PROP_HIDE_CUSTOM_COLOUR) )
+        else if ( !allow && !(m_flags & wxPG_PROP_HIDE_CUSTOM_COLOUR) )
         {
             // Hide custom choice
             m_choices.RemoveAt(GetCustomColourIndex());