function Leadtools.Annotations.Automation.AnnPlatformCallbacks()
Many operations such as determining the keyboard state and copying/pasting annotation objects from the clipboard are platform-specific. The automation manager helper for the platform will create an instance of AnnPlatformCallbacks and update the platform-specific callbacks. It will then set this instance into PlatformCallbacks.
The AnnAutomation objects will then use this property to perform any specific operation that require a platform-specific action.