Getting the active MdiChild from RadDock?

Hi PEDDI,

Thank you for contacting us.

The outcome you experience is expected with Data Access Q3 2015 as the Visual Studio integration (the support for .rlinq files) was deprecated with Data Access Q2 2015. The last version of Data Access that distributes the assemblies and  supports .rlinq files is Q1 2015. Currently, the Data Access runtime assemblies are available only through five NuGet packages. More details on the deprecation are available in this blog post. 

In order to maintain and upgrade further your existing projects that consume Data Access (especially such with .rlinq files), you can apply any of the following suggestions:

Option 1*: Migrate the .rlinq file to a fluent model and integrate the latest NuGet packages. The details and the workflow about the migration process are available here. With this option you will be able to work with Visual Studio 2012, Visual Studio 2013, and Visual Studio 2015, but all the changes in the database will have to be applied in the model manually.

Option 2*: Freeze the version of Data Access on Q1 2015. Since Data Access Q1 2015 is the last version that distributes the Visual Studio integration, with this option you won't need to migrate the model. With this option you will have the integration in Visual Studio 2012 and Visual Studio 2013 (meaning that you will be able to work as you used to with your .rlinq file), but you will not be able to upgrade the solution to Visual Studio 2015.

*You will need to obtain Data Access Q1 2015 (you can download it from your Telerik account, here).

I hope this helps.

Regards,
Doroteya
Telerik