Fix resolving bindable properties

src/Controls/src/Core/BindablePropertyConverter.cs

@@ -113,7 +113,7 @@ static Type GetControlType(string typeName)
 		BindableProperty ConvertFrom(Type type, string propertyName, IXmlLineInfo lineinfo)
 		{
 			string name = propertyName + "Property";
-			FieldInfo bpinfo = type.GetField(name, BindingFlags.Public | BindingFlags.Static);
+			FieldInfo bpinfo = type.GetField(name, BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy);
 			if (bpinfo == null || bpinfo.FieldType != typeof(BindableProperty))
 				throw new XamlParseException($"Can't resolve {name} on {type.Name}", lineinfo);
 			var bp = bpinfo.GetValue(null) as BindableProperty;