How do you use the Tag Prefix property?
You can find a description of the Tag Prefix property in the WinCC Online Help at "WinCC Information System > Working with WinCC > VBS for Creating Procedures and Actions > VBS Reference > Characteristics > T > TagPrefix Property" .
Any change to the Tag Prefix property only becomes effective when the picture is reloaded. This happens automatically when the picture is changed; otherwise, you may reassign the "Picture Name" property. The two figures below contains possible scripts for C and VBS.
Alternatively, you can go to the "Display" property and hide the picture window and then show it again in order to reload the picture.