I found two threads with this replys and i maked the solution
http://www.telerik.com/community/forums/thread/b311D-beegmk.aspx
http://www.telerik.com/community/forums/thread/b311D-bdhmmm.aspx
In the showdialog of rad windows i make this functions
function showDialog(windows) { |
var oWnd = window.radopen(null, windows); |
oWnd.setUrl(oWnd.get_navigateUrl()); |
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var menu = $find('<%= Master.FindControl("RadMenu1").ClientID %>'); |
menu.get_element().style.zIndex = 0; |
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} |