It seems that there is a problem with your project references. I would recommend performing the following steps in order to make sure that the correct references are set:
- Delete all Telerik references from your project
- Start the Convert wizard from the Telerik menu in your Visual Studio and proceed through the project conversion process.
Regarding your question about RadTabControl. This control has not been obsolete or replaced, it is still valid and should be used as before. However, RadDragAndDropManager has been obsolete and will be removed in future. We recommend using the DragDropManager instead. I suppose you have code regarding drag and drop operations, if so, you should use the new DragDropmanger control.
Please let us know if you have any questions.
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