[TKinter]How to set LabelFrames font and color from option file

[Beppe]

Hi to everybody, 

I don't succeed in planning the value of the font and color in the LabelFrames using the option_db file, such as

*LabelFrame*font: Helvetica 14
*LabelFrame*foreground: red

exist a list of the keywordses to use?

thanks

beppe