force redraw only through EVT_PAINT event and use wxPaintDC, as described in wx documentation
<?xml version='1.0' encoding='utf-8'?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.plcopen.org/xml/tc6_0201" xmlns:xhtml="http://www.w3.org/1999/xhtml" xsi:schemaLocation="http://www.plcopen.org/xml/tc6_0201">
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<contentHeader name="Beremiz wxHMI test" modificationDateTime="2017-06-05T14:01:40">
<coordinateInfo>
<pageSize x="1024" y="1024"/>
<fbd>
<scaling x="5" y="5"/>
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<ld>
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<sfc>
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<types>
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<pous>
<pou name="main_pytest" pouType="program">
<interface>
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<variable name="getCheckBoxState">
<type>
<derived name="python_poll"/>
</type>
</variable>
<variable name="counter">
<type>
<INT/>
</type>
</variable>
<variable name="setSpinCtrlValue">
<type>
<derived name="python_poll"/>
</type>
</variable>
</localVars>
</interface>
<body>
<FBD>
<block localId="24" width="125" height="90" typeName="python_poll" instanceName="getCheckBoxState" executionOrderId="0">
<position x="480" y="215"/>
<inputVariables>
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<connectionPointIn>
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<connection refLocalId="25">
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<position x="420" y="250"/>
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<variable formalParameter="CODE">
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<connectionPointOut>
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<variable formalParameter="RESULT">
<connectionPointOut>
<relPosition x="125" y="70"/>
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</block>
<inVariable localId="25" height="30" width="100" executionOrderId="0" negated="false">
<position x="320" y="235"/>
<connectionPointOut>
<relPosition x="100" y="15"/>
</connectionPointOut>
<expression>BOOL#TRUE</expression>
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<inVariable localId="26" height="30" width="400" executionOrderId="0" negated="false">
<position x="20" y="270"/>
<connectionPointOut>
<relPosition x="400" y="15"/>
</connectionPointOut>
<expression>'int(HMIFrame.checkbox_1.GetValue())'</expression>
</inVariable>
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<position x="535" y="505"/>
<connectionPointOut>
<relPosition x="40" y="15"/>
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<expression>')'</expression>
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<position x="150" y="415"/>
<connectionPointOut>
<relPosition x="330" y="15"/>
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<expression>'HMIFrame.spin_ctrl_1.SetValue('</expression>
</inVariable>
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<position x="1130" y="250"/>
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<position x="90" y="500"/>
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<variable formalParameter="IN2">
<connectionPointIn>
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<position x="125" y="520"/>
<position x="125" y="540"/>
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<position x="320" y="500"/>
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<position x="520" y="480"/>
<position x="500" y="480"/>
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<position x="480" y="430"/>
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<position x="500" y="500"/>
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<variable formalParameter="IN3">
<connectionPointIn>
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<expression>counter</expression>
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<variable formalParameter="IN">
<connectionPointIn>
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<position x="320" y="500"/>
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<variable formalParameter="ENO">
<connectionPointOut>
<relPosition x="145" y="30"/>
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<connectionPointOut>
<relPosition x="145" y="50"/>
</connectionPointOut>
</variable>
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<block localId="36" width="125" height="90" typeName="python_poll" instanceName="setSpinCtrlValue" executionOrderId="0">
<position x="735" y="425"/>
<inputVariables>
<variable formalParameter="TRIG">
<connectionPointIn>
<relPosition x="0" y="35"/>
<connection refLocalId="34" formalParameter="ENO">
<position x="735" y="460"/>
<position x="685" y="460"/>
</connection>
</connectionPointIn>
</variable>
<variable formalParameter="CODE">
<connectionPointIn>
<relPosition x="0" y="70"/>
<connection refLocalId="34" formalParameter="OUT">
<position x="735" y="495"/>
<position x="715" y="495"/>
<position x="715" y="480"/>
<position x="685" y="480"/>
</connection>
</connectionPointIn>
</variable>
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<inOutVariables/>
<outputVariables>
<variable formalParameter="ACK">
<connectionPointOut>
<relPosition x="125" y="35"/>
</connectionPointOut>
</variable>
<variable formalParameter="RESULT">
<connectionPointOut>
<relPosition x="125" y="70"/>
</connectionPointOut>
</variable>
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<position x="870" y="255"/>
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<variable formalParameter="IN">
<connectionPointIn>
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<position x="815" y="285"/>
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<variable formalParameter="OUT">
<connectionPointOut>
<relPosition x="125" y="30"/>
</connectionPointOut>
</variable>
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</block>
<block localId="38" width="80" height="95" typeName="AND" executionOrderId="0">
<position x="1050" y="210"/>
<inputVariables>
<variable formalParameter="IN1">
<connectionPointIn>
<relPosition x="0" y="40"/>
<connection refLocalId="30" formalParameter="ENO">
<position x="1050" y="250"/>
<position x="815" y="250"/>
</connection>
</connectionPointIn>
</variable>
<variable formalParameter="IN2">
<connectionPointIn>
<relPosition x="0" y="75"/>
<connection refLocalId="37" formalParameter="OUT">
<position x="1050" y="285"/>
<position x="995" y="285"/>
</connection>
</connectionPointIn>
</variable>
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<inOutVariables/>
<outputVariables>
<variable formalParameter="OUT">
<connectionPointOut>
<relPosition x="80" y="40"/>
</connectionPointOut>
</variable>
</outputVariables>
</block>
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<position x="30" y="485"/>
<connectionPointOut>
<relPosition x="60" y="15"/>
</connectionPointOut>
<expression>INT#1</expression>
</inVariable>
<comment localId="101" height="115" width="680">
<position x="10" y="30"/>
<content>
<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>
</content>
</comment>
</FBD>
</body>
</pou>
</pous>
</types>
<instances>
<configurations>
<configuration name="config">
<resource name="res_pytest">
<task name="pytest_task" interval="t#100ms" priority="0"/>
<pouInstance name="pytest_instance" typeName="main_pytest"/>
</resource>
</configuration>
</configurations>
</instances>
</project>