The "dd" property on a Window is now "undefined" in the after render method whereas it was not in 4.0.7.
See:
Code:win = Ext.create("Ext.window.Window",cfg); /* win.dd below will be undefined in 4.1.0 and 4.1.1.rc-1 but not in 4.0.7-4.0.0 */ win.on({ afterrender: function () { win.dd.xTickSize = me.xTickSize; win.dd.yTickSize = me.yTickSize; if (win.resizer) { win.resizer.widthIncrement = me.xTickSize; win.resizer.heightIncrement = me.yTickSize; } }, single: true });