Progress for datagrid loading in window pop up using loadXML


I am using dhtmlxWindow and attaching dhtmlxTabbar .Each tab has setContent as dhtmlxGrid div tag.I am loading the data using loadXMLString .By using loadXMLString I need to show some progress happening for user to know for loading the grid.onXLS and onXLE works for loadXML…So is any other method there for loadXMLString

There is no any special events for loadXMLString command because it works in sync. mode, which means js command next to loadXMLString will be executed when loading finished.
( unfortunately sync. mode introduce difficulties for showing any kin of custom message, because browser will not render anything until sync process finished )