Hide a binded TreeViewItem in a TreeView

Question

Hello,
In my application, i have binded a ObservableCollection to a TreeView using an HierarchicalDataTemplate. On some condition i am firing an command and i have to hide few of the treeviewitems from the treeview. 
In this command, few conditions i am checking in the back end code and setting a property 'IsRequiredInView' to true. Now when this property is true, i have to make the treeviewitem visible in the view. I tried using the Visibility property but it will show
the empty space in the view where TreeViewItem was present.
How i can hide the entire treeViewItem from the TreeView?
Thanks in advance,
IamHuM

Answer 1

>>How i can hide the entire treeViewItem from the TreeView?
By setting its Visibility property to Collapsed. You could do this by defining an ItemContainerStyle:
<TreeView>
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<Style.Triggers>
<!-- hide the item with Header = "1" -->
<Trigger Property="Header" Value="1">
<Setter Property="Visibility" Value="Collapsed"/>
</Trigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle>
<TreeViewItem Header="1"/>
<TreeViewItem Header="2"/>
<TreeViewItem Header="3"/>
</TreeView>
If you have a boolean property called IsRequiredInView in the data context class of the TreeView you could use a DataTrigger that sets the Visibility property of the TreeViewItem conditionally when this property returns true or false:
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<Style.Triggers>
<DataTrigger Binding="{Binding IsRequiredInView}" Value="False">
<Setter Property="Visibility" Value="Collapsed"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle>
Hope that helps.
Please provide a reproducable sample of your issue if you want any further help. Bet setting the Visibility property in an ItemContainerStyle is the key to be able to hide a TreeViewItem.
Please also remember close your threads by marking helpful posts as answer and then start a new thread if you have a new question. Please don't ask several questions in the same thread.