Can "processing" spinner behavior DEFAULT to making entire screen ALWAYS modal ?

<zk>
	<device-config>
		<device-type>ajax</device-type>
			<embed><![CDATA[
				<script type="text/javascript">
					zk.afterLoad("zk", function () {
						// store the old functions
						var oldShowBusy = zAu.cmd0.showBusy;
						var oldClearBusy = zAu.cmd0.clearBusy;
						zAu.cmd0.showBusy = function (uuid, msg) {
							if (arguments.length == 2) {
								oldShowBusy(null, msg);
							} else
								oldShowBusy.apply(this, arguments);
						};
						zAu.cmd0.clearBusy = function (uuid) {
							oldClearBusy(null);
						}
					});
				</script>
		]]></embed>
	</device-config>
</zk>

<zk>
	<label id="lb" value="test label" />
	<button label="busy on page">
		<attribute name="onClick">
			Clients.showBusy("busy...");
			tmOne.start();
		</attribute>
	</button>
	<!-- Show busy on label 'lb' and clear it after 3 seconds -->
	<button label="busy on listbox">
		<attribute name="onClick">
			Clients.showBusy(lb, "busy...");
			tmTwo.start();
		</attribute>
	</button>
	<timer id="tmOne" delay="3000" repeats="false" running="false" onTimer="Clients.clearBusy();" />
	<timer id="tmTwo" delay="3000" repeats="false" running="false" onTimer="Clients.clearBusy(lb);" />
</zk>

	<script type="text/javascript">
		zk.afterLoad("zk", function () {
			var oldProgressbox = zUtl.progressbox;
			zUtl.progressbox = function () {
				oldProgressbox.apply(this, arguments);
				var $mask = jq('.z-loading');
				if ($mask) {
					var $img = jq('.z-loading-indicator'),
						$body = jq(document.body),
						body = $body[0],
						bw = $body.width() + body.scrollLeft - 10,
						bh = $body.height() + body.scrollTop - 10;

					// update mask and image's style
					$mask.width(bw);
					$mask.height(bh);

					$img.width('150px');
					$img.css('margin-left', (bw - $img.width()) / 2 + 'px');
					$img.css('margin-top', (bh - $img.height()) / 2 + 'px');

					// update mask size when window scroll
					if (!window.eventBinded) {
						var $win = jq(window);
						$win.scroll(function () {
							var $maskInst = jq('.z-loading');
							if ($maskInst[0]) {
								$maskInst.width(bw + $win.scrollLeft());
								$maskInst.height(bh + $win.scrollTop());
							}
						});
						window.eventBinded = true;
					}
				}
			}
		});
	</script>