MMCN_ACTIVATE
[This is preliminary documentation and subject to change.] 
Sent to the snap-in's IComponent::Notify method when a window is being activated or deactivated.
Parameters
- 
lpDataObject
- 
[in] Pointer to the data object of the currently selected scope pane item.
- 
arg 
- 
TRUE if the window is activated; otherwise, it is FALSE.
- 
param 
- 
Not used.
Return Values
Not used.
See Also
IComponent::Notify