Question

I’m using WPF, MVVM & PRISM.
I got a datatemplate in my View linked to a ViewModel UC2002_RFPBeheren_ViewModel cause the page were this code is included is linked to another ViewModel and I want the Button to have UC2002_RFPBeheren_ViewModel as ViewModel.

The datacontext of this page is UC2002_RFPBeheren_ProjectInfo_ViewModel but I want the SaveButton to use the ViewModel UC2002_RFPBeheren_ViewModel

Here is my code:

<UserControl.Resources>
<ResourceDictionary>
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="../Resources/RFPModuleResources.xaml" />
        <ResourceDictionary>
            <DataTemplate x:Key="SaveButton" DataType="{x:Type vm:UC2002_RFPBeheren_ViewModel}">
                <Button Command="{Binding SaveRFPCommand}">Save</Button>
            </DataTemplate>
        </ResourceDictionary>
    </ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>

<StackPanel HorizontalAlignment="Right" Orientation="Horizontal">
   <ContentControl ContentTemplate="{StaticResource SaveButton}"/>
   <Button Command="{Binding CloseTabCommand}">Close</Button>
</StackPanel>

Although the SaveButton displays but don’t reacts on my command.
Do I forget something or is there another way to solve this?
Thanks in advance 😉 !

=================================================================================

EDIT:

So I made some changes but it still doesn’t work.

Code example:

<UserControl.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="../Resources/RFPModuleResources.xaml" />
            <ResourceDictionary>
                <DataTemplate x:Key="SaveButton" DataType="{x:Type vm:UC2002_RFPBeheren_ViewModel}">
                    <Button Command="{Binding SaveRFPCommand}">Save</Button>
                </DataTemplate>
            </ResourceDictionary>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</UserControl.Resources>

I set this property in the ViewModel of the page

public UC2002_RFPBeheren_ViewModel MySaveVM { get; set; }

My stackpanel looks now like this:

<StackPanel HorizontalAlignment="Right" Orientation="Horizontal">
    <ContentControl Content="{Binding MySaveVM}" ContentTemplate="{StaticResource SaveButton}"/>
    <Button Command="{Binding CloseTabCommand}">Close</Button>
</StackPanel>

Answer 1

what happens if you set your UV2002_RFPBeheren_ViewModel instance as the content for the ContentPresenter?

 <ContentControl Content="{Binding MyUV2002_RFPBeheren_ViewModel}"/>

the DataTemplate just say how your Viewmodel should be displayed, but you have to set the DataContext or Binding to the instance of your viewmodel.

EDIT:

example

 public class VMFoo
 {
     public UV2002_RFPBeheren_ViewModel MySaveVM {get; set;}
 }

xaml

<UserControl.Resources>
<ResourceDictionary>
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="../Resources/RFPModuleResources.xaml" />
        <ResourceDictionary>
            <DataTemplate x:Key="SaveButton" DataType="{x:Type vm:UC2002_RFPBeheren_ViewModel}">
                <Button Command="{Binding SaveRFPCommand}">Save</Button>
            </DataTemplate>
        </ResourceDictionary>
    </ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<UserControl.DataContext>
   <x:local VMFoo/>
</UserControl.DataContext>
<StackPanel HorizontalAlignment="Right" Orientation="Horizontal">
   <ContentControl Content="{Binding MySaveVM}"/>
   <Button Command="{Binding CloseTabCommand}">Close</Button>
</StackPanel>

EDIT: Small working sample

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:WpfApplication1="clr-namespace:WpfApplication1" Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <ResourceDictionary>
        <DataTemplate DataType="{x:Type WpfApplication1:UV2002_RFPBeheren_ViewModel}">
            <Button Command="{Binding SaveRFPCommand}">Save</Button>
        </DataTemplate>
    </ResourceDictionary>
</Window.Resources>
<Grid> 
    <Grid.DataContext>
        <WpfApplication1:VMFoo/>
    </Grid.DataContext>
    <StackPanel HorizontalAlignment="Right" Orientation="Horizontal">
        <ContentControl Content="{Binding MySaveVM}"/>
        <Button Command="{Binding CloseTabCommand}">Close</Button>
    </StackPanel>
</Grid>
</Window>

Viewmodels

public class VMFoo
{
    public VMFoo()
    {
        this.MySaveVM = new UV2002_RFPBeheren_ViewModel();
    }
    public UV2002_RFPBeheren_ViewModel MySaveVM { get; set; }
}

public class UV2002_RFPBeheren_ViewModel
{
    private DelegateCommand _save;
    public ICommand SaveRFPCommand
    {
        get{if(this._save==null)
        {
            this._save = new DelegateCommand(()=>MessageBox.Show("success"),()=>true);
        }
            return this._save;
        }
    }
}