Microsoft Test Manager–control recognition, plus supported configurations & platforms.

Some controls are not recognized without added help. You need to make sure that the controls being added to the solution by development are first compatible and second have be referenced so that they are recognizable by MTM.

Silverlight Control recognition:

How to setup up your Silverlight Application for Testing instructions.

Set a Unique Automation Property for Silverlight Controls for Testing

Testing WPF application check this out.

Supported configurations and platforms for Action Recordings and Coded UI Tests check this out.

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