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ABL Reference
Handle Attributes and Methods Reference : FLAT-BUTTON attribute
 

FLAT-BUTTON attribute

(Windows only; Graphical interfaces only)
Indicates whether a button is two-dimensional until the mouse passes over it, at which time, a 3D border appears.
Data type: LOGICAL
Access: Readable/Writable
Applies to: BUTTON widget
The FLAT-BUTTON attribute must be set before the button is realized. The default value is FALSE.
Setting the FLAT-BUTTON attribute to TRUE forces the NO-FOCUS attribute to TRUE because the FLAT-BUTTON attribute only works with the NO-FOCUS attribute. Similarly, setting the NO-FOCUS attribute to FALSE forces the FLAT-BUTTON attribute to FALSE.
The mnemonic key (ALT accelerator) for a widget will not work if the NO-FOCUS attribute is TRUE because this removes the widget from the tab order. Also, because the widget is not in the tab order, pressing TAB will not change focus from the widget.