Updates an item in the storage.
dwFlags may have the following values:
- BCGP_GANTT_ITEM_PROP_NAME
 
- BCGP_GANTT_ITEM_PROP_START
 
- BCGP_GANTT_ITEM_PROP_FINISH
 
- BCGP_GANTT_ITEM_PROP_PROGRESS
 
- BCGP_GANTT_ITEM_PROP_PRIORITY
 
- BCGP_GANTT_ITEM_PROP_SELECTED
 
- BCGP_GANTT_ITEM_PROP_GROUPITEM
 
- BCGP_GANTT_ITEM_PROP_GROUPOFFSET
 
- BCGP_GANTT_ITEM_PROP_COLOR1
 
- BCGP_GANTT_ITEM_PROP_COLOR2
 
- BCGP_GANTT_ITEM_PROP_VISIBLE
 
- BCGP_GANTT_ITEM_PROP_ENABLED
 
- BCGP_GANTT_ITEM_PROP_CHECKED
 
- BCGP_GANTT_ITEM_PROP_TOOLTIP
 
- BCGP_GANTT_ITEM_PROP_DATA
 
- BCGP_GANTT_ITEM_PROP_NONE
 
- BCGP_GANTT_ITEM_PROP_ALL
 
- Parameters
 - 
  
    | dwFlags | Specifies what properties should be updated in the storage. |