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loadmask not function

How insert loadmask? i'm using win = desktop.createWindow but when the window loads the loadMask don't show nothing

RE:loadMask not function

the loadMask is controlled as a configuration option on either:

var MIF = new Ext.ux.ManagedIFrame('existingFrameID',{src:'page.php',loadMask:{msg:'Loading Site..'});

or

var MIFP = new Ext.ux.ManagedIframePanel({
             id         : 'MIFP',
             defaultSrc : 'page.php',
             loadMask   : {msg:'Loading Site..'}
           });