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 Line  | 
M  | 
Description  | 
|---|---|---|
A list of the properties of the line.  | 
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x  | 
(exp) Background settings for the line.  | 
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The band containing the line.  | 
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x  | 
Whether the control appears once per page when printing newspaper columns.  | 
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x  | 
Whether the user can move the line.  | 
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The name of the line control.  | 
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x  | 
(exp) Appearance settings of the line.  | 
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x  | 
(exp) The pointer image when it is over the line.  | 
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x  | 
Whether the user can resize the line.  | 
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x  | 
(exp) Whether the line moves left to fill empty space.  | 
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x  | 
(exp) How the line moves up to fill empty space.  | 
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x  | 
(exp) The tag text for the line.  | 
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The control’s type, which is Line.  | 
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x  | 
(exp) Whether the Line control is visible.  | 
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x  | 
(exp) The x coordinate of each end of the line.  | 
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x  | 
(exp) The y coordinate of each end of the line.  |