Sets the first image.
<p>
The image can be null.
The image in column 0 is reserved for the [+] and [-]
images of the tree, therefore do nothing.
@param image the new image or null
@exception SWTException <ul>
<li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread</li>
<li>ERROR_WIDGET_DISPOSED when the widget has been disposed</li>
</ul>
Sets the first image. <p> The image can be null. The image in column 0 is reserved for the [+] and [-] images of the tree, therefore do nothing.
@param image the new image or null
@exception SWTException <ul> <li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread</li> <li>ERROR_WIDGET_DISPOSED when the widget has been disposed</li> </ul>