Set the control that appears on the left side of the banner.
The left control is optional. Setting the left control to null will remove it from
the banner - however, the creator of the control must dispose of the control.
@param control the control to be displayed on the left or null
@exception SWTException <ul>
<li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
<li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
<li>ERROR_INVALID_ARGUMENT - if the left control was not created as a child of the receiver</li>
</ul>
Set the control that appears on the left side of the banner. The left control is optional. Setting the left control to null will remove it from the banner - however, the creator of the control must dispose of the control.
@param control the control to be displayed on the left or null
@exception SWTException <ul> <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> <li>ERROR_INVALID_ARGUMENT - if the left control was not created as a child of the receiver</li> </ul>
@since 3.0