Returns the receiver's line dash style. The default value is <code>null</code>.
@return the line dash style used for drawing lines
@exception SWTException <ul> <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> </ul>
@since 3.1
See Implementation
Returns the receiver's line dash style. The default value is <code>null</code>.
@return the line dash style used for drawing lines
@exception SWTException <ul> <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> </ul>
@since 3.1