TDN_EXPANDO_BUTTON_CLICKED notification code
Sent by the task dialog when the user clicks on the dialog's expando button. This notification is received only through the task dialog callback function, which can be registered using the TaskDialogIndirect method.
A BOOL that is TRUE if the dialog is expanded, or FALSE if not.
Must be zero.
The return value is ignored.
The example in the Syntax section shows the cast to wParam before sending the notification. LPARAM is not used and must be zero.
Minimum supported client
|Windows Vista [desktop apps only]|
Minimum supported server
|Windows Server 2008 [desktop apps only]|