2483e263_TCL_TK_Command_Reference_Guide__Configure_Option
[Resource Name] state [Resource Class] State [Description] State of button. Options are: active (mouse pointer over button, use activeforeground and activebackground),disabled (button is insensitive, use disabledforeground and background), or normal (use foreground and background). [Configure Option] 
-state state
TCL/TK Command Reference Guide