I need to select a time item TimeItemStyle=image with the click mouse but the time item start and finish is equal.
No action on image
This is what we call a FixedSize time item, it has no length and is common in milestones etc.
In GTP.NET you set FixedSizeUse to true and FixedSize to a pixel value in the time item layout.
In phGantTimePackage you set IphDataEntity_GantTime2.FixedSize to the pixel value you need