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<!-- Flat ComboBox -->
  <SolidColorBrush x:Key="ComboBoxNormalBorderBrush" Color="#e3e9ef" />
  <SolidColorBrush x:Key="ComboBoxNormalBackgroundBrush" Color="#fff" />
  <SolidColorBrush x:Key="ComboBoxDisabledForegroundBrush" Color="#888" />
  <SolidColorBrush x:Key="ComboBoxDisabledBackgroundBrush" Color="#eee" />
  <SolidColorBrush x:Key="ComboBoxDisabledBorderBrush" Color="#888" />

  <ControlTemplate TargetType="ToggleButton" x:Key="ComboBoxToggleButtonTemplate">
    <Grid>
      <Grid.ColumnDefinitions>