Populating combobox inside a listbox datatemplate based on another combox's selected item in WPF

Question

In my wpf application, I have a Listbox control. Listbox control can have multiple rows. Inside the Listbox's DataTemplate I have two dropdowns in each row. For brevity,

<Listbox>
 <ItemTemplate>
 <DataTemplate DataType="{x:Type someModel}">
 <Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
    <ComboBox Grid.Column="0" Name="ComboBox1" ItemSource="{Binding listData}">  
    </ComboBox>  
    <ComboBox Grid.Column="1" Name="ComboBox2" ItemSource="{Binding listData2}">  
    </ComboBox>  
</Grid
 </DataTemplate>
</ItemTemplate>
</Listbox>

My question is how can I update the ItemSource of ComboBox1 based on the selection of ComboBox2 of a particular row in the list?

See the picture below for more clarification about the requirement: