There is no system variable available. You
can read a value in the registry to detect the active theme, e.g
with the CallVB statement (GuiXT Controls component). The SAP
GUI theme is stored in[HKEY_CURRENT_USER\Software\SAP\General\Appearance]
"SelectedTheme"=dword:00000080
(128=Blue Crystal Theme)
The value for the themes are:
Signature 1
Enjoy 2
System specifc 4
Corbu: 64
Blue Crystal Theme: 128