To close the context menu (to make it disapper without selecting any item) we need to click (mousekeypress[mouseDown and mouseup]) on other areas of the page. Whether it is possible to close the context menu during mouse down event itself?
I have one suggestion to achieve the functionality, you can try to hide the menu on the onmousedown client side event as shown below,
I have tried with calling the javascript from the body onmousedown<bodyonmousedown="Hide()">
function Hide()
{
var menu = $find("<%=RadContextMenu1.ClientID %>");