1. Create a new Form that inherits from RadForm and add some rad controls. 2. Checkin the file in your source control system 3. Open the form in design time will cause checkout
We looked into the issue and it appears to be related to the RadCommandBar and RadStatusStrip controls. It is not a general issue with the RadForm and the Telerik controls. In case there are command bar and status strip controls added to the form, opening the designer may cause a checkout if the SizingGrip property of the status strip is set to false.
I think this is an important fix as far as presentation of telerik products. People may be using a trial and seeing this and it impacts their decision as to purchase the product or not.