Returns the receiver's text, which will be an empty
string if it has never been set or if the receiver is
an <code>ARROW</code> button.
@return the receiver's text
@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>
</ul>
Returns the receiver's text, which will be an empty string if it has never been set or if the receiver is an <code>ARROW</code> button.
@return the receiver's text
@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> </ul>