silverstripe-framework/css/TreeDropdownField.css

div.TreeDropdownField {
	width: 35em;
	padding: 0;
}
html>body div.TreeDropdownField {
	position:relative;
}

div.TreeDropdownField span.items {
	display: block;
	height: 100%;
	border: 1px #7f9db9 solid;
	cursor: pointer;
	width: 33em;
	float: left;
	padding-top: 2px;
	padding-bottom: 2px;
	background-color: white;
}

div.TreeDropdownField div.tree_holder {
	clear: left;
	cursor: default;
	border: 1px black solid;
	margin: 0;
	height: 200px;
	overflow: auto;
	background-color: white;
	/**
	 * HACK IE6, see http://www.hedgerwow.com/360/bugs/css-select-free.html
	 */
	position:absolute;
	z-index:10;
	width:33em;/*must have for any value*/;
}

html>body div.TreeDropdownField div.tree_holder {
	top: 20px;
	left: 0px;
	z-index: 1000;
}

/**
 * HACK IE6, see http://www.hedgerwow.com/360/bugs/css-select-free.html
 */
div.TreeDropdownField div.tree_holder iframe {
	display:none;/* IE5*/
	display/**/:block;/* IE5*/
	position:absolute;
	top:0;
	left:0;
	z-index:-1;
	filter:mask();
	width:31em;/*must have for any big value*/
	height:200px/*must have for any big value*/;
}

div.TreeDropdownField a.editLink {
	border-width: 1px 1px 1px 0;
	background: url(../../sapphire/images/TreeDropdownField_button.gif) left top no-repeat;
	width: 19px;
	height: 21px;
	margin: 0;
	padding: 0;
	float: left;
	clear: right;
	z-index: 0;
	overflow: hidden;
}