MDI Child and DateTimePicker Problem in 2.5.xx

Hello I’ve notice “this.ActiveMdiChild” is not returning null when MDI Parent is empty and also the case of my Date Range Dialog-Form pressing escape key will close the dialog-form but when the datetimepicker is on focus.. escape-key didn’t close the dialog-form or  DateRange-Form, if other control like textbox, button etc. is on focus pressing escape-key works and close the dialog-form… but this works in version 2.2.60…