Checks that this class can be subclassed. <p> IMPORTANT: See the comment in <code>Widget.checkSubclass()</code>. </p>
Throws an exception if the specified widget can not be used as a parent for the receiver.
Does whatever dialog specific cleanup is required, and then uses the code in <code>SWTError.error</code> to handle the error.
Returns the receiver's parent, which must be a <code>Shell</code> or null.
Returns the receiver's style information. <p> Note that, the value which is returned by this method <em>may not match</em> the value which was provided to the constructor when the receiver was created. </p>
Returns the receiver's text, which is the string that the window manager will typically display as the receiver's <em>title</em>. If the text has not previously been set, returns an empty string.
Sets the receiver's text, which is the string that the window manager will typically display as the receiver's <em>title</em>, to the argument, which must not be null.