Hi Michael,
It looks like you are using the third-party control, right? Please read the
"Supported Controls" article - it contains the list of the officially supported controls. If the MGrid control is inherited from one of them, you can use the Object Mapping feature that can make TestComplete treat your control as the supported one. Refer to the
What If My Control Is Not Supported? section in the article for details.
If the control isn't supported, you will need to test the control via calling its native methods and properties. The control's documentation should contain information about the methods you can use. Refer to the
"Accessing Native Properties and Methods of Delphi Objects" article to learn how to call them in TestComplete. Also, I suggest that you explore our How To - it contains many examples of testing custom controls using native properties and methods:
http://support.smartbear.com/howto
