I've created two ActiveX control in one .ocx. "Ambiguous name detected ~"

I've created two ActiveX control in one .ocx.

myControls.ocx:
-myGrid.ctl
-myTextBox.ctl

So far I have added the new control (myTextBox) and rebuilded the ocx, it cant be loaded.

I created a new .exe app and tried to add "myControls" to components I get this error:
"Ambiguous name detected ~"

During building the ocx there is no problem. If I remove the myTextBox from the ocx it can be loaded again. What could be the problem?

plz help