How do I stretch the row on a tree view? Changing the Horizontal Content Alignment doesn't work

I have a TreeViewAdv and populated it. There's a problem though because the rows doesn't stretch horizontally to fill the entire TreeViewAdv. This happened to me on a regular TreeView and the fix was to set the default TreeViewItem's 'Horizontal Content' to 'Stretch'. Unfortunately I don't know how to do this with a TreeViewAdv. I've uploaded a winrar file containing the image of what my TreeViewAdv currently looks like and what I wanted it to look like.
Attachment: TreeViewAdv_4d2b2d82.rar

Hi Mark,

 

Thank you for contacting Syncfusion Support.

 

We have checked the reported case “Horizontal Content Alignment is not working for Stretch “ with TreeViewAdv using our simple sample and we were able to reproduce it this behavior. We are currently validating this behavior and analyzing any workable solution . We will check and update you the details on or before 21^st Nov 2019.

 

Regards,

Vijayalakshmi V.R.

<syncfusion:TreeViewAdv x:Name="Tree" ItemsSource ="{Binding Items, Mode=TwoWay}" MultiColumnEnable="True" >  <syncfusion:TreeViewAdv.DataContext>  <local:ViewModel/>  </syncfusion:TreeViewAdv.DataContext>    <syncfusion:TreeViewAdv.ItemTemplate>  <HierarchicalDataTemplate ItemsSource="{Binding Models}">  <ContentControl Content="{Binding}"/>  </HierarchicalDataTemplate>  </syncfusion:TreeViewAdv.ItemTemplate>    <syncfusion:TreeViewAdv.Columns>  <syncfusion:TreeViewColumnCollection>  <syncfusion:TreeViewColumn Width="300" Header="Name">  <syncfusion:TreeViewColumn.CellTemplate>  <DataTemplate>  <TextBlock Text="{Binding Name}"/>  </DataTemplate>  </syncfusion:TreeViewColumn.CellTemplate>  </syncfusion:TreeViewColumn>  <syncfusion:TreeViewColumn MinWidth="60" Header="Quantity">  <syncfusion:TreeViewColumn.CellTemplate>  <DataTemplate>  <TextBlock Text="{Binding Quantity}" HorizontalAlignment="Center"/>  </DataTemplate>  </syncfusion:TreeViewColumn.CellTemplate>  </syncfusion:TreeViewColumn>  <syncfusion:TreeViewColumn MinWidth="60" Header="UnitPrice">  <syncfusion:TreeViewColumn.CellTemplate>  <DataTemplate>  <TextBlock Text="{Binding UnitPrice}"/>  </DataTemplate>  </syncfusion:TreeViewColumn.CellTemplate>  </syncfusion:TreeViewColumn>  <syncfusion:TreeViewColumn MinWidth="100" Header="UnitPriceAmount">  <syncfusion:TreeViewColumn.CellTemplate>  <DataTemplate>  <TextBlock Text="{Binding UnitPriceAmount}"/>  </DataTemplate>  </syncfusion:TreeViewColumn.CellTemplate>  </syncfusion:TreeViewColumn>  </syncfusion:TreeViewColumnCollection>  </syncfusion:TreeViewAdv.Columns>  </syncfusion:TreeViewAdv>