Thank you for contacting us.
Based on the provided details, I would recommend you try to reset the Visual Studio Toolbox as right-clicking at it and select Reset Toolbox
option. Please take a look at the attached reset-toolbox.png
Could you please reset the Visual Studio Toolbox, try again to include the Telerik UI for WinForms
controls into your project and let us know in case the issue with the inability to move the controls still persist?
When it comes to your question about registering the UI for WinForms
controls into the Visual Studio 2012 Toolbox, only using the drag-drop approach
is possible in your case. In short, the WinForms msi installer with Q1 2010 version has a support only for Visual Studio 2005, 2008 and 2010, but not for Visual Studio 2012 and the controls are not registered there.
Please let me know in case any further assistance is needed.
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