egtbeamwall/EgtBEAMWALL.Optimizer/Panel/LeftPanelTopV.xaml

<Grid x:Class="LeftPanelTopV"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:OPTIMIZER="clr-namespace:EgtBEAMWALL.Optimizer"
      Style="{StaticResource Left_Grid}">
   <Grid.ColumnDefinitions>
      <ColumnDefinition Width="1*"/>
      <ColumnDefinition Width="Auto"/>
   </Grid.ColumnDefinitions>
   <OPTIMIZER:LeftPanelV x:Name="LeftPanel" DataContext="{StaticResource LeftPanelVM}"
                         Tag="{Binding DataContext.BTLStructureVM, RelativeSource={RelativeSource AncestorType={x:Type OPTIMIZER:LeftPanelTopV}}}"
                         IsEnabled="{Binding DataContext.LeftPanel_IsEnabled, RelativeSource={RelativeSource AncestorType={x:Type OPTIMIZER:LeftPanelTopV}}}"
                         Opacity="{Binding DataContext.LeftPanel_Opacity, RelativeSource={RelativeSource AncestorType={x:Type OPTIMIZER:LeftPanelTopV}}}"/>

   <OPTIMIZER:OptimizePanelV Grid.Column="1"
                             DataContext="{StaticResource OptimizePanelVM}"
                             Visibility="{Binding DataContext.OptimizePanel_Visibility, RelativeSource={RelativeSource AncestorType={x:Type OPTIMIZER:LeftPanelTopV}}}"/>
</Grid>