Set the control that appears in the top left corner of the pane.
Typically this is a label such as CLabel.
The topLeft is optional. Setting the top left control to null will remove it from
the pane - however, the creator of the control must dispose of the control.
*
@param c the control to be displayed in the top left corner 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 control is not a child of this ViewForm</li>
</ul>
Set the control that appears in the top left corner of the pane. Typically this is a label such as CLabel. The topLeft is optional. Setting the top left control to null will remove it from the pane - however, the creator of the control must dispose of the control. * @param c the control to be displayed in the top left corner 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 control is not a child of this ViewForm</li> </ul>