Boban,
The VFP base classes have certain methods and events that have default behavior, for example the keypress event onf the textbox base class appends the character typed to the end of the Value of the textbox. This behavior occurs regardless as to whether you have written code in the KeyPress event of you textbox or not. If, for example, you want to process the key stroke yourself and you don't want the VFP default behavior to occur you would issue the command NODEFAULT which tells VFP "Do not do your default behavior".