Bug 184602 [Progress] "Widget is disposed" when setting builders twice during build
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/ProgressMonitorDialog.java
* Clear the cursors in the dialog.
	 * 
	 * @since 3.0
	 */
	protected void clearCursors() {
		if (cancel != null && !cancel.isDisposed()) {
			cancel.setCursor(null);
		}
		Shell shell = getShell();
		if (shell != null && !shell.isDisposed()) {
			shell.setCursor(null);
		}
		if (arrowCursor != null) {
			arrowCursor.dispose();
		}
		if (waitCursor != null) {
			waitCursor.dispose();
		}
		arrowCursor = null;
		waitCursor = null;
	}
	/*
	 * (non-Javadoc) Method declared in Window.
	 */
	protected void configureShell(final Shell shell) {
		super.configureShell(shell);
		shell.setText(JFaceResources.getString("ProgressMonitorDialog.title")); 
		if (waitCursor == null) {
			waitCursor = new Cursor(shell.getDisplay(), SWT.CURSOR_WAIT);
		}