Hi,
if you have a symbol, with different sizes in different scale ranges, the extent of the selection of this symbol is in all scale ranges the same (the first occuring in the layerdefinition). 

MGOS 2.2
Ajax Viewer

sample layerdafinition:
<?xml version="1.0" encoding="utf-8"?>
<LayerDefinition xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" version="1.0.0" xsi:noNamespaceSchemaLocation="LayerDefinition-1.0.0.xsd">
  <VectorLayerDefinition>
    <ResourceId>Library://symboltest/test.FeatureSource</ResourceId>
    <FeatureName>Schema1:test</FeatureName>
    <FeatureNameType>FeatureClass</FeatureNameType>
    <Geometry>Geom</Geometry>
    <VectorScaleRange>
      <MaxScale>50000</MaxScale>
      <PointTypeStyle>
        <DisplayAsText>false</DisplayAsText>
        <AllowOverpost>false</AllowOverpost>
        <PointRule>
          <LegendLabel />
          <PointSymbolization2D>
            <Mark>
              <Unit>Points</Unit>
              <SizeContext>DeviceUnits</SizeContext>
              <SizeX>50</SizeX>
              <SizeY>50</SizeY>
              <Rotation>0</Rotation>
              <Shape>Square</Shape>
              <Fill>
                <FillPattern>Solid</FillPattern>
                <ForegroundColor>ffffffff</ForegroundColor>
                <BackgroundColor>ffffffff</BackgroundColor>
              </Fill>
              <Edge>
                <LineStyle>Solid</LineStyle>
                <Thickness>1</Thickness>
                <Color>ff000000</Color>
                <Unit>Points</Unit>
              </Edge>
            </Mark>
          </PointSymbolization2D>
        </PointRule>
      </PointTypeStyle>
    </VectorScaleRange>
    <VectorScaleRange>
      <MinScale>50000</MinScale>
      <PointTypeStyle>
        <DisplayAsText>false</DisplayAsText>
        <AllowOverpost>false</AllowOverpost>
        <PointRule>
          <LegendLabel />
          <PointSymbolization2D>
            <Mark>
              <Unit>Points</Unit>
              <SizeContext>DeviceUnits</SizeContext>
              <SizeX>10</SizeX>
              <SizeY>10</SizeY>
              <Rotation>0</Rotation>
              <Shape>Square</Shape>
              <Fill>
                <FillPattern>Solid</FillPattern>
                <ForegroundColor>ffffffff</ForegroundColor>
                <BackgroundColor>ffffffff</BackgroundColor>
              </Fill>
              <Edge>
                <LineStyle>Solid</LineStyle>
                <Thickness>1</Thickness>
                <Color>ff000000</Color>
                <Unit>Points</Unit>
              </Edge>
            </Mark>
          </PointSymbolization2D>
        </PointRule>
      </PointTypeStyle>
    </VectorScaleRange>
  </VectorLayerDefinition>
</LayerDefinition>

        
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