DataWidgets, NanoflowCommons and NativeMobileResources use a .version file in their themesource folder. For DataGrid 2, which lives in the DataWidgets module, the version of DataWidgets can be found in your project folder here:
themesource\datawidgets\.version
The .version file is just a text file holding the current version number of the module in your project
Open your mpr using the MprTool executable in the modeler installer directory. When you select the DataWidgets module it will give you the version as listed in the Marketplace when you downloaded it.