Question

How I can see a tool tip on a gantt item in VC++ using phGantXControl.ocx?

Answer

Every environment has it own way of controlling tooltip windows so:

There is no built in tooltip in the phGant or phSchema. But if you implement the event IphGantX3.OnHintInfo you will get all the information you normally associate with a ToolTip that might show when dragging a time item.

You need to create and control the tooltip window yourself, decide how it should look and what information etc, then use the OnHintInfo or MouseMove events to bring it up.