During using Teechart active X, the language of Teechart Edit Dialog is changed to japanese or chinese.(don't know exactly what language)
How can I recover to English?
At design time, open the contextual menu (right click on the chart). The "Language" option is the second from the bottom:
Then, in the next screen, "English" is the first item in the list:
Close and restart the IDE to apply the changes on the contextual menu.