View Controls show/hide WPF MVVM - wpf

Question

I have a View (in MVVM) which have some controls including a treeview. A ViewModel which is the datacontext and a Model, everything is working fine till now. **I have two cases:
**
I want my View to show a ContextMenu against Treeview items.
The other case, it should not show a ContextMenu against the Treeview items
Is this possible with one View or there should be two different Views for this purpose, for my personal work it would be better if I have one View.
The VM and model are very simple just having the binded properties of the View.
View.xaml
<UserControl x:Class="SPM.SystemExplorer.View.SystemExplorerView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:SPM.SystemExplorer.View"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
xmlns:viewModel="clr-namespace:SPM.SystemExplorer.ViewModel"
xmlns:classes="clr-namespace:SPM.SystemExplorer.Classes">
<UserControl.DataContext>
<viewModel:SystemExplorerViewVM></viewModel:SystemExplorerViewVM>
</UserControl.DataContext>
<Grid>
<StackPanel>
<Label Content="{Binding Test}"></Label>
<TreeView Grid.Row="1" ItemsSource="{Binding SystemProjects}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type classes:SystemProject}" ItemsSource="{Binding ParticipantProjects}">
<StackPanel Orientation="Horizontal">
<TreeViewItem Header="{Binding NameOfSystemProject}"></TreeViewItem>
<TreeViewItem Header="{Binding AuthorOfSystemProject}"></TreeViewItem>
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type classes:ParticipantProject}">
<StackPanel Orientation="Horizontal">
<TreeViewItem Header="{Binding NameOfParticipantProject}"></TreeViewItem>
<TreeViewItem Header="{Binding AuthorOfParticipantProject}"></TreeViewItem>
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
</StackPanel>
</Grid>

Answer 1

You could add a property (ShowContextMenu) to your SystemExplorerViewVM class that you set to true/false depending on whether you want to display the ContextMenu. You could then use a Style with a DataTrigger in your XAML:
<TreeView Grid.Row="1" ItemsSource="{Binding SystemProjects}">
<TreeView.Resources>
<ContextMenu x:Key="cm">
<MenuItem Header="1" />
<MenuItem Header="2" />
</ContextMenu>
<Style TargetType="TreeViewItem">
<Style.Triggers>
<DataTrigger Binding="{Binding DataContext.ShowContextMenu, RelativeSource={RelativeSource AncestorType=UserControl}}" Value="True">
<Setter Property="ContextMenu" Value="{StaticResource cm}" />
</DataTrigger>
</Style.Triggers>
</Style>
<HierarchicalDataTemplate DataType="{x:Type classes:SystemProject}" ItemsSource="{Binding ParticipantProjects}">
<StackPanel Orientation="Horizontal">
<TreeViewItem Header="{Binding NameOfSystemProject}"></TreeViewItem>
<TreeViewItem Header="{Binding AuthorOfSystemProject}"></TreeViewItem>
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type classes:ParticipantProject}">
<StackPanel Orientation="Horizontal">
<TreeViewItem Header="{Binding NameOfParticipantProject}"></TreeViewItem>
<TreeViewItem Header="{Binding AuthorOfParticipantProject}"></TreeViewItem>
</StackPanel>
</HierarchicalDataTemplate>
</TreeView>