dear all,

is it possible to enable Ajax functionality in locate/search product page of control panel similar like the product info display in store? if possible how complex it is.

Thanks in advance for the help!.

If you have some familiarity with javascript and ASP coding, probably yes. If not, hire someone that does.  And I'm not sure that there are any conflicts between the admin or not, but before you break your admin you should have a pretty good idea of what you are doing.

There are references to the associated .js and .css files, some additional javascript and HTML code, and there is a "onmouseover" reference that needs to be added to the hyperlinks. 

<link type="text/css" rel="stylesheet" href="ei-tooltip.css">
<script language="javascript" type="text/javascript" src="ei-tooltip.js"></script>

<!--AJAX Functions-->
all the code between these comments
<!--End of AJAX Functions-->

And the ASP scripting that makes the javascript reference has to be implemented.
<a href="PCMXviewPrd.asp?idcategory=3&idproduct=1917" onmouseover="javascript:document.getPrd.idproduct.value='191 7'; sav_callxml='1'; return runXML1('prd_1917');" onmouseout="javascript: sav_callxml=''; hidetip();"><img src="catalog/dg380w_1523_thumb.jpg" alt="Dri-Fast Advantage™ Ladies' Piqué Polo with side-stripe"></a></p>

Once all that code has been referenced, then you have to examine it and make sure all the paths are correct and possibly other changes. 

It's not likely a simple effort.