Sets the receiver's line style to the argument, which must be one
of the constants <code>SWT.LINE_SOLID</code>, <code>SWT.LINE_DASH</code>,
<code>SWT.LINE_DOT</code>, <code>SWT.LINE_DASHDOT</code> or
<code>SWT.LINE_DASHDOTDOT</code>.
@param lineStyle the style to be used for drawing lines
@exception IllegalArgumentException <ul>
<li>ERROR_INVALID_ARGUMENT - if the style is not valid</li>
</ul>
@exception SWTException <ul>
<li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
</ul>
Sets the receiver's line style to the argument, which must be one of the constants <code>SWT.LINE_SOLID</code>, <code>SWT.LINE_DASH</code>, <code>SWT.LINE_DOT</code>, <code>SWT.LINE_DASHDOT</code> or <code>SWT.LINE_DASHDOTDOT</code>.
@param lineStyle the style to be used for drawing lines
@exception IllegalArgumentException <ul> <li>ERROR_INVALID_ARGUMENT - if the style is not valid</li> </ul> @exception SWTException <ul> <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> </ul>