SVGHMI: allow designating widget's sub-elements as main element child rather than descendant. Names staring with "/" in yslt call to labels() only match direct widget childs.
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<xhtml:p><![CDATA[This example shows how IEC program in PLC can interact with UI created using wxGlade.
"WxGlade GUI" is extension to build user interface for PLC using wxGlade.
To edit user interface click on "WxGlade" icon in extension settings.]]></xhtml:p>
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