beremiz

Fixed preview drawing/refresh problem in sfc/ld/fbd graphical element creation dialogs on windows (introduced in 9c5f835b031e, continuation of 9622418ac28c)
<?xml version='1.0' encoding='utf-8'?>
<BACnetServerNode xmlns:xsd="http://www.w3.org/2001/XMLSchema" UDP_Port_Number="47808" BACnet_Device_ID="3" BACnet_Communication_Control_Password=" " BACnet_Device_Location="Beremiz lab" Network_Interface="virbr0"/>