Inserts a group into a list-view control.
- Index where the group is to be added. If this is -1, the group is added at the end of the list.
- Pointer to a [**LVGROUP**](/windows/desktop/api/Commctrl/ns-commctrl-taglvgroup) structure that contains the group to add.
Returns the index of the item that the group was added to, or -1 if the operation failed.
A group cannot be inserted into an empty list-view control.
Be sure to set the iGroupId in the item(s) the group was added to. Otherwise after LVM_ENABLEGROUPVIEW message processing with TRUE the listview control will not show any items.
To use this message, you must provide a manifest specifying Comclt32 version 6.0. For more information on manifests, see Enabling Visual Styles.
|Minimum supported client
||Windows Vista [desktop apps only]
|Minimum supported server
||Windows Server 2003 [desktop apps only]