An x in the M (Modify) column means you can change the property. When (exp) is included in the description, you can specify a DataWindow expression as the value for that property.
Property for a Button  | 
M  | 
Description  | 
|---|---|---|
x  | 
A description of the control for use by assistive technology tools.  | 
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x  | 
A descriptive label for the control.  | 
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A description of the kind of user-interface element that the control is.  | 
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x  | 
Background settings for the button.  | 
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x  | 
(exp) The text color.  | 
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x  | 
Whether or not the action’s default picture is to be used on the button (user-defined action has no default picture).  | 
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x  | 
Determines whether a button control on a DataWindow is enabled.  | 
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x  | 
(exp) Name of the file containing the picture to be used on the button (if not specified, just the text is used).  | 
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x  | 
(exp) Font settings for the text.  | 
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x  | 
(exp) How the text in the button is horizontally aligned. Values are: 0 (center), 1 (left), 2 (right).  | 
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x  | 
(exp) The height of the button control.  | 
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x  | 
Whether the button control appears once per page when printing newspaper columns.  | 
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x  | 
Whether the user can move the button control.  | 
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The name of the button control.  | 
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x  | 
(exp) The pointer image when it is over the button control.  | 
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x  | 
Whether the user can resize the button control.  | 
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x  | 
(exp) Whether the button control moves left to fill in empty space.  | 
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x  | 
(exp) How the button control moves up to fill in empty space.  | 
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x  | 
Whether or not ButtonClicked and ButtonClicking events are fired for this particular button.  | 
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x  | 
(exp) The tag text for the button control.  | 
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x  | 
(exp) The displayed text.  | 
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The control’s type, which is button.  | 
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x  | 
(exp) How the text in the button is vertically aligned. Values are: 0 (center), 1 (top), 2 (bottom), 3 (multiline).  | 
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x  | 
(exp) Whether the button control is visible.  | 
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x  | 
(exp) The width of the button control.  | 
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x  | 
(exp) The x coordinate of the button control.  | 
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x  | 
(exp) The y coordinate of the button control.  |