Inside Macintosh: Mac OS 8 Toolbox Reference /

Chapter 2 - Control Manager Reference / Control Manager Functions

Handling Events in Controls /

FindControl

NOT RECOMMENDED WITH THE APPEARANCE MANAGER

When the Appearance Manager is available, you should call FindControlUnderMouse to determine whether a mouse-down event occurred in a control. FindControlUnderMouse will return a handle to the control even if no part was hit and can determine whether a mouse-down event has occurred even if the control is deactivated, while FindControl does not.