You need to define the data template as CellTemplate for your column:
<ListView x:Name="lbDatabases" Height="138" Width="498" Canvas.Left="44" Canvas.Top="146" >
<ListView.View >
<GridView >
<GridViewColumn Header="Databases" Width="498">
<GridViewColumn.CellTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding IsActive}" Checked="AnyChange" Unchecked="AnyChange" Style="{x:Null}" Content="{Binding DbName}"
Width="{Binding CheckWidth}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>