Steps to Reproduce

http://zkfiddle.org/sample/31g33oj/1-combobox-case-before-select

Run fiddle
In the combobox type "-abc" (dash character, then lowercase string)
use keyboard arrow to move the carret (selection cursor) to 1st position, then use del to remove the dash.
tab out or click out to trigger blur

Current Result

During blur > onChange, the onChange event is sent first (with the original abc value)
Then, highlight triggers and format the string to uppercase
on server side, the org.zkoss.zul.Combobox.syncValueToSelection() tries to match comboitems to the string lowercase abc

Expected Result

Highlight should trigger first, and the value sent to the server for org.zkoss.zul.Combobox.syncValueToSelection() should be uppercase ABC

Debug Info

Root Cause

Workaround

<script><![CDATA[  
	zk.afterLoad('zul.inp', function() {
		var xCombobox = {};
		zk.override(zul.inp.Combobox.prototype, xCombobox ,{
			updateChange_ : function() {
				this._hilite({sendOnSelect: true, noSelectRange: true});
				var result = xCombobox.updateChange_.apply(this, arguments);
				return result;
			}
		});//zk.override
	});//zk.afterLoad
	]]></script>