Thanks for your posting and using Aspose.Cells.
You can only work with or manipulate Form Controls using Aspose.Cells. But you cannot work with or manipulate ActiveX Controls.
If you are having issues with Form Controls, then please let us know, we will look into it and help you asap.
Please also see the following documentation article that explains how to work with form controls using Aspose.Cells.
Please see the following screenshot for your further reference.