Error on Xamarin.Android Sample Project

[tkmawarire]

I am having an error compiling the Xamanin.Android sample.

Error CS0426 The type name 'IIsExpandedChangedListener' does not exist in the type 'ExpandableEditorGroup' Samples E:\Projects\Active\Android Master\Android-samples-master\Samples-Xamarin\Fragments\Dataform\DataFormExpandableGroupsFragment.cs on Line 42

&&

Error CS1061 'ExpandableEditorGroup' does not contain a definition for 'AddIsExpandedChangedListener' and no extension method 'AddIsExpandedChangedListener' accepting a first argument of type 'ExpandableEditorGroup' could be found (are you missing a using directive or an assembly reference?) Samples E:\Projects\Active\Android Master\Android-samples-master\Samples-Xamarin\Fragments\Dataform\DataFormExpandableGroupsFragment.cs on Line 33

Here is a screenshot