Fixed preview drawing/refresh problem in sfc/ld/fbd graphical element creation dialogs on windows (introduced in 9c5f835b031e, continuation of 9622418ac28c)
<xsd:attribute name="Command" type="xsd:string" use="optional" default="make -C %(buildpath)s all BEREMIZSRC=%(src)s BEREMIZCFLAGS=%(cflags)s MD5=%(md5)s USE_BEREMIZ=1 FROM_BEREMIZ=1"/>