Hack to label Google Map controls with known identifiers so you can address specific elements. Requires Jquery.

gmaps_controls_identifier.js

controlList = {
	'map_type_control': 'margin-top: 5px; margin-right: 5px; margin-bottom: 5px; margin-left: 5px; z-index: 11; position: absolute; cursor: pointer; right: 0px; top: 0px; ',
	'pan_control': 'cursor: url(https://maps-api-ssl.google.com/intl/en_us/mapfiles/openhand_8_8.cur), default; width: 78px; height: 78px; position: absolute; left: 0px; top: 0px; ',
	'zoom_control': 'position: absolute; left: 27px; top: 128px; ',
	'streetmap_control': 'width: 32px; height: 38px; overflow-x: hidden; overflow-y: hidden; position: absolute; left: 0px; top: 0px; ',
	'hidden_streetmap_control': 'width: 32px; height: 38px; overflow-x: hidden; overflow-y: hidden; position: absolute; left: 0px; top: 0px; visibility: hidden; ',
};

function labelControlsWithId() {
	
	$.each(controlList, function(id, attr) {
	  ctrls = $('div[style*="' + attr + '"]')
	  if ( ctrls.length == 1 ) {
	  	ctrls.attr('id',id);
	  } else {
	  	ctrls.each( function(index){ $(this).attr('id', id + "_" + index); });
	 	}
	});
}

Tested on Google Maps API v3.4