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dhtmlxCombo sync with enableFilteringMode

1. Is there an event that fires after the xml is returned from the "url" while using the enableFilteringMode(mode,url,cache,autosubload) method ?
We want to be able to do something once the combobox is populated with the options returned from the server.

2. When the enableFilteringMode(mode,url,cache,autosubload) method is used, the server request is made with mask=TEXT as request parameter, where TEXT is the text in the combobox. Can an additional request parameter be sent to the server at the same time?

We are evaluating your grid, calendar and combobox components before purchasing and prompt help will be greatly appreciated.

Thanks,
Haresh.

There is no such event in current version, but next build will introduce onXLS and onXLE events, which will work in same manner as for other component ( will fire when xml loading started | finished ) 
Updated version of js file attached. 

>>Can an additional request parameter be sent to the server at the same time?
You can form url used in enableFilteringMode mode , so it will contain any necessary parameters. 
There is no way to change the URL dynamically.