I just created a very simple UWP project, added a reference to Actipro Universal Windows Controls and added a Int32Picker to the Main Page.
If I open whe MainPage.xaml with Visual Studio, I can see the design view without any problems. If I open it with Blend what I see in the design view is the next exception:
COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
at System.Runtime.InteropServices.WindowsRuntime.IVector'1.InsertAt(UInt32 index, T value)
at System.Runtime.InteropServices.WindowsRuntime.VectorToListAdapter.InsertAtHelper[T](IVector'1 _this, UInt32 index, T item)
at System.Runtime.InteropServices.WindowsRuntime.VectorToListAdapter.Insert[T](Int32 index, T item)
Thinking could be a licensing problem, I've added the license information in the app initialization but the problem is still there.
The project's target versions are:
Target: Universal Windows
Target version: Windows 10 Creators Update (10.0; Build 15063)
Min version: Windows 10 Creators Update (10.0; Build 15063)
Blend's about dialog box shows this version information:
Microsoft Blend for Visual Studio Professional 2017
Version 15.2 (26430.15) Release
Microsoft .NET Framework 4.7.02046