How about add this to your xaml:

    &lt;Separator/&gt;

I had the same issue and eventually chose to use a Rectangle element:

`&lt;Rectangle HorizontalAlignment=&quot;Stretch&quot; Fill=&quot;Blue&quot; Height=&quot;4&quot;/&gt;`

In my opinion it&#39;s somewhat easier to modify/shape than a separator.
Of course the `Separator` is a very easy and neat solution for simple separations :)

Use a Border of height 1 and don&#39;t set the Width (i.e. Width = Auto, HorizontalAlignment = Stretch, the default)

For anyone else struggling with this: [Qwertie&#39;s comment][comment] worked well for me. 

    &lt;Border Width=&quot;1&quot; Margin=&quot;2&quot; Background=&quot;#8888&quot;/&gt;

This creates a vertical seperator which you can talior to suit your needs.

[comment]: https://stackoverflow.com/questions/2314975/simple-i-think-horizontal-line-in-wpf#comment18701114_2314986

    To draw Horizontal 
    ************************    
    &lt;Rectangle  HorizontalAlignment=&quot;Stretch&quot;  VerticalAlignment=&quot;Center&quot; Fill=&quot;DarkCyan&quot; Height=&quot;4&quot;/&gt;

    To draw vertical 
    *******************
     &lt;Rectangle  HorizontalAlignment=&quot;Stretch&quot; VerticalAlignment=&quot;Center&quot; Fill=&quot;DarkCyan&quot; Height=&quot;4&quot; Width=&quot;Auto&quot; &gt;
            &lt;Rectangle.RenderTransform&gt;
                &lt;TransformGroup&gt;
                    &lt;ScaleTransform/&gt;
                    &lt;SkewTransform/&gt;
                    &lt;RotateTransform Angle=&quot;90&quot;/&gt;
                    &lt;TranslateTransform/&gt;
                &lt;/TransformGroup&gt;
            &lt;/Rectangle.RenderTransform&gt;
        &lt;/Rectangle&gt;

If I have some R list `mylist`, you can append an item `obj` to it like so:

    mylist[[length(mylist)+1]] &lt;- obj

But surely there is some more compact way.  When I was new at R, I  tried writing `lappend()` like so:

    lappend &lt;- function(lst, obj) {
        lst[[length(lst)+1]] &lt;- obj
        return(lst)
    }

but of course that doesn&#39;t work due to R&#39;s call-by-name semantics (`lst` is effectively copied upon call, so changes to `lst` are not visible outside the scope of `lappend()`.  I know you can do environment hacking in an R function to reach outside the scope of your function and mutate the calling environment, but that seems like a large hammer to write a simple append function.

Can anyone suggest a more beautiful way of doing this? Bonus points if it works for both vectors and lists.

Append an object to a list in R in amortized constant time, O(1)?

Can subdomains (domain names) have underscore `_` in them?

Can (domain name) subdomains have an underscore &quot;_&quot; in it?

Creating a relatively simple data entry form, and just want to separate certain sections with a horizontal line (not unlike an HR tag in HTML) that stretches the full length of the form.

I have tried this:

    &lt;Line Stretch=&quot;Fill&quot; Stroke=&quot;Black&quot; X2=&quot;1&quot;/&gt;

Because the parent control is not a fixed width, this line causes the window to stretch to the full width of the screen.

Is there an easy way to do this without fixing the width of my parent control/window?



Simple (I think) Horizontal Line in WPF?

Creating a relatively simple data entry form, and just want to separate certain sections with a horizontal line (not unlike an HR tag in HTML) that stretches the full length of the form.
I have tried this:
<pre><code class="hljs language-ini">&#x3C;Line Stretch="Fill" Stroke="Black" X2="1"/>
</code></pre>
Because the parent control is not a fixed width, this line causes the window to stretch to the full width of the screen.
Is there an easy way to do this without fixing the width of my parent control/window?

&lt;!-- language-all: lang-cs --&gt;

I am using http://www.codeproject.com/KB/IP/Facebook_API.aspx

I am trying to call the [XAML][1] which is created using [WPF][2]. But it gives me an error:

&gt; The calling thread must be STA, because many UI components require this.

I don&#39;t know what to do. I am trying to do this:

    FacebookApplication.FacebookFriendsList ffl = new FacebookFriendsList();

But it is giving me that error.

I added a background worker:

    static BackgroundWorker bw = new BackgroundWorker();

    static void Main(string[] args)
    {
        bw.DoWork += bw_DoWork;
        bw.RunWorkerAsync(&quot;Message to worker&quot;);
        Console.ReadLine();
    }

    static void bw_DoWork(object sender, DoWorkEventArgs e)
    {
        // This is called on the worker thread
        FacebookApplication.FacebookFriendsList ffl = new FacebookFriendsList();

        Console.WriteLine(e.Argument);        // Writes &quot;Message to worker&quot;

        // Perform time-consuming task...
    }

  [1]: http://en.wikipedia.org/wiki/Extensible_Application_Markup_Language
  [2]: http://en.wikipedia.org/wiki/Windows_Presentation_Foundation



The calling thread must be STA, because many UI components require this

In my application, I have a `ListBox` with items. The application is written in WPF.

How can I scroll automatically to the last added item? I want the `ScrollViewer` to be moved to the end of the list when new item has been added.

Is there any event like `ItemsChanged`? 
(I don&#39;t want to use the `SelectionChanged` event)

WPF ListBox Scroll to end automatically

I&#39;m supposed to be able to access the [Dispatcher][1] that belongs to the View I need to pass it to the ViewModel. But the View should not know anything about the ViewModel, so how do you pass it? Introduce an interface or instead of passing it to the instances create a global dispatcher singleton that will be written by the View? How do you solve this in your MVVM applications and frameworks?

EDIT: Note that since my ViewModels might be created in background threads I can&#39;t just do `Dispatcher.Current` in the constructor of the ViewModel.


  [1]: http://msdn.microsoft.com/en-us/magazine/cc163328.aspx

How to pass the UI Dispatcher to the ViewModel 

I have a group of buttons that should act like toggle buttons, but also as radio buttons where only one button can be selected / pressed down at a current time. It also need to have a state where none of the buttons are selected / pressed down.

The behavior will be kind of like Photoshop toolbar, where zero or one of the tools are selected at any time!

Any idea how this can be implemented in WPF?

How to get a group of toggle buttons to act like radio buttons in WPF?

I want the border to turn green when the mouse is over it and then to return to blue when the mouse is no longer over the border. 

I attempted this without any luck:

    &lt;Border 
        Name=&quot;ClearButtonBorder&quot; 
        Grid.Column=&quot;1&quot; 
        CornerRadius=&quot;0,3,3,0&quot; 
        Background=&quot;Blue&quot;&gt;
        &lt;Border.Triggers&gt;
            &lt;Trigger Property=&quot;Border.IsMouseOver&quot; Value=&quot;True&quot;&gt;
                &lt;Setter Property=&quot;Border.Background&quot; Value=&quot;Green&quot; /&gt;
            &lt;/Trigger&gt;
            &lt;Trigger Property=&quot;Border.IsMouseOver&quot; Value=&quot;False&quot;&gt;
                &lt;Setter Property=&quot;Border.Background&quot; Value=&quot;Blue&quot; /&gt;
            &lt;/Trigger&gt;
        &lt;/Border.Triggers&gt;
        &lt;TextBlock 
            HorizontalAlignment=&quot;Center&quot; 
            VerticalAlignment=&quot;Center&quot; 
            Text=&quot;X&quot; /&gt;
    &lt;/Border&gt;

How can one set a trigger or events for MouseOver?

How to set MouseOver event/trigger for border in XAML?

How could I set the value of the `Height` property of a WPF control in C# code to &quot;`Auto`&quot;?

    &lt;Grid.RowDefinitions&gt;
        &lt;RowDefinition /&gt;
        &lt;RowDefinition Height=&quot;Auto&quot; /&gt;
        &lt;RowDefinition /&gt;
        &lt;RowDefinition Height=&quot;Auto&quot; /&gt;
        &lt;RowDefinition /&gt;
        &lt;RowDefinition Height=&quot;Auto&quot; /&gt;
        &lt;RowDefinition /&gt;
        &lt;RowDefinition Height=&quot;Auto&quot; /&gt;
        &lt;RowDefinition /&gt;
    &lt;/Grid.RowDefinitions&gt;

I want to reproduce this behavior in the code behind. Any ideas?

WPF Auto height in code

In my particular case, I want to bind to the IsReadOnly property of a TextBox to set the Content property of a Button? They are both part of the same StackPanel.

I&#39;ve tried doing it with a DataTrigger with a Binding to the ElementName of the TextBox and a Trigger using the TextBox name as the SourceName.

Any thoughts?

How do I bind to another control&#39;s property from a trigger?

I have a `PasswordBox`. how can I get the input value from the `PasswordBox` after the input has been finished?

C# how to get text value from PasswordBox?

I have a simple `Button` control that contains an `Image` object as its content. I want so set the `Image` opacity to 0.5 when the `Button` is disabled to provide an additional visual cue as to the `Button` status. 

What is the simplest way to accomplish that result in XAML? Thanks for your help.

&#39;Graying Out&#39; a WPF button image?

How does one add a `ContextMenu` to a `DataGrid`? I want to be able to right click anywhere on the DataGrid. 


How to add context menu to wpf datagrid?

Is that possible to set an integer value in WPF control Resources?!


    &lt;UserControl.Resources&gt;

        &lt;SolidColorBrush x:Key=&quot;MyLineBrush&quot; Color=&quot;LightGreen&quot; /&gt;

        ??? &lt;Integer x:Key=&quot;MyStrokeThickness&quot; Value=&quot;2&quot; /&gt; ???

    
        &lt;Style TargetType=&quot;local:MyLine&quot; x:Key=&quot;MyLineStyleKey&quot;&gt;    

            &lt;Setter Property=&quot;Stroke&quot; 
                Value=&quot;{DynamicResource MyLineBrush}&quot;/&gt;

            &lt;Setter Property=&quot;StrokeThickness&quot; 
                Value=&quot;{DynamicResource MyStrokeThickness}&quot;/&gt;

        &lt;/Style&gt;

In order to modify dynamically the `MyLineBrush` and `MyStrokeThickness` values...

An integer value in WPF Resources?

I want to format my string binding as `Amount is X` where `X` is a property bound to a label.

I&#39;ve seen many examples but the following doesn&#39;t work:

    &lt;Label Content=&quot;{Binding Path=MaxLevelofInvestment, 
       StringFormat=&#39;Amount is {0}&#39;}&quot; /&gt;

I&#39;ve also tried these combinations:

    StringFormat=Amount is {0}
    StringFormat=&#39;Amount is {}{0}&#39;
    StringFormat=&#39;Amount is \{0\}&#39;

I even tried changing the binding property&#39;s datatype to `int`, `string`and `double`. Nothing seems to work. This is a very common use case but doesn&#39;t seem to be supported.




Content Type	Original Author	Original Content on Stackoverflow
Question	Phil Sandler	View Question on Stackoverflow
Solution 1 - Wpf	Adel Hazzah	View Answer on Stackoverflow
Solution 2 - Wpf	Deruijter	View Answer on Stackoverflow
Solution 3 - Wpf	Ana Betts	View Answer on Stackoverflow
Solution 4 - Wpf	P_Fitz	View Answer on Stackoverflow
Solution 5 - Wpf	shaiju mathew	View Answer on Stackoverflow

Simple (I think) Horizontal Line in WPF?

Wpf Problem Overview

Wpf Solutions

Solution 1 - Wpf

Solution 2 - Wpf

Solution 3 - Wpf

Solution 4 - Wpf

Solution 5 - Wpf

Can (domain name) subdomains have an underscore "_" in it?

Append an object to a list in R in amortized constant time, O(1)?

Attributions