Develop Reference

How to change Content property in ContentControl

I have custom ContentControl
public class MyContentControl: ContentControl
{....}
with Content defined in XAML like this
<controls:MyContentControl x:Name="myContentControl">
<controls:MyContentControl.Content>
<controls:UserControl1 />
</controls:MyContentControl.Content>
</controls:MyContentControl>
Content shows in designer and in the device when I launch my application. But when I try to change Content property programmatically, for example
UserControl2 control2 = new UserControl2();
myContentControl.Content = control2;
MyContentControl shows nothing. Using standard ContentControl give the same result.
Any suggestions are welcome.

I followed your code to make simple code sample to test. There's no problem.
public class CustomContentControl:ContentControl
{//......}
<Grid>
<local:CustomContentControl x:Name="content">
</local:CustomContentControl>
</Grid>
MyUserControl1 myUserControl1 = new MyUserControl1();
content.Content = myUserControl1;
<UserControl
x:Class="AppContent.MyUserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:AppContent"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="400">
<Grid>
<TextBox Text="abc"></TextBox>
</Grid>
You might have done some specific settings in your code. #Martin Zikmund's suggestion also was reasonable. You could refer to his suggestion and check your code. After that, if you still could not solve this issue, please provide a Minimal, Complete, and Verifiable example.

This should work. The reason could be that the control does not stretch and is displayed just 0x0 in size. Try to set absolute Width and Height to the control2 and check if it displays. You can also set myContentControl.HorizontalContentStretch and myContentControl.VerticalContentStretch.
You can try running the app in debugger and then use the Live Property Explorer to see what the actual size of the control inside Content is.

Ok, I found out where the things went wrong. I am using different controls for desktop and mobile devices, so I put some of theirs XAML views to the DeviceFamily-Mobile folder. This way they automatically use when needed. I've confused namespaces, because all XAML views in this folder have a root namespace for accessibility reasons. When I was trying to add control to the ContentControl via c#, I didn't resolve namespace where my controls were placed. So I've put XAML view as a childs to the ContentControl, and they staying invisible as none of them has InitializeComponent() method. Adding correct controls with initialization fixed my problem.
I am very grateful for your answers, they pointed me to the right way.

How to set the Edge label in GraphX

I am using GraphX in Winform project. I am trying to display labels besides the edges. I want to know what property do I have to set in order to display some text in the label.
I have tried setting the 'Text' property of DataEdge, and then calling
ShowAllEdgesLabels(true);
but it does not work this way. Going through the forums I have found that WPF has a way to bind this property to the visual control. The XAML code is as follows
<gxl:EdgeLabelControl x:Name="PART_edgeLabel" Content="{Binding Edge.Text, RelativeSource={RelativeSource TemplatedParent}}" />
Now the question is what is the equivalent of Winform to achieve this functionality.

I found a solution with the help of the admin at the host of GraphX (PantheR).
Basically, we need to add the hostControler for WPF in a windows form.
We need to add a custom XAML template in the resources folder.
We need to load the XAML as a new resource in the code, before we initialize the graph.
We need to add a line of code to merge the resources.
Then in the XAML code we do the binding as mentioned in the question. The code has been updated at the repository to reflect these changes.
The downfall of this solution is that, we need to provide a XAML resource file with the program, but thats just another resource (in my opinion).

For anyone that need some reference code from #ResVic's answer:
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:graphx="http://schemas.panthernet.ru/graphx/"
xmlns:local="clr-namespace:YOUR_NAME_SPACE">
...
<Style TargetType="{x:Type graphx:AttachableEdgeLabelControl}">
<Setter Property="ShowLabel" Value="False" />
</Style>
...
</ResourceDictionary>
The Show case demo is protentially helpful for figuring out what stuff the lib could do and how to tweak it to work.

Disable StackPanel Highlighting in XAML

I have found very little information about this matter. Know that I am a newbie to C# and WPF:
I have a stack panel defined in a XAML file as such :
<StackPanel Orientation="Vertical" >
<TextBlock Text="Locale: " VerticalAlignment="Center"/>
<ComboBox x:Name="comboLocale" Width="60" VerticalAlignment="Center" SelectionChanged="comboLocale_SelectionChanged"/>
</StackPanel>
I want to disable the highlighting that happens when I MouseOver the stack panel, which creates a blue color inside the StackPanel for some reason. I don't have any special style set up yet. Some threads talked about setting OverridesDefaultStyle to TRUE, but this didn't seem to change anything. Also, StackPanel do not have a ControlTemplate available, so most of the solutions I found couldn't be applied since they refer to a Button or TextBlock.
Any input on the matter would be greatly appreciated!
-Regards

StackPanels in general have no visual representation and are just layout containers which control placement of other elements. Given that you haven't set anything like Background on your StackPanel, it isn't what's causing the highlight you're seeing unless some other part of your XAML or code is modifying it. The behavior you describe sounds like the default behavior of a Button but without seeing more of your code it's hard to tell where the behavior is coming from.

Since you mentioned in a comment you've found out you're actually looking at the expected behavior of a Menu as your culprit. You'll just need to edit the MenuItem Control Template, more specifically the IsHighlighted that's causing your highlight. You'd likely find something like this helpful.
Or there's lots more various information found with a quick search for customizing a WPF Menu / MenuItem, hope this helps.

Changing the page header text in XAML

How do I change the default page header in a Windows 8 XAML application? The question is simple, just I am still learning XAML.
<Page.DataContext>
<local:MainPageViewModel/>
</Page.DataContext>
<!-- PageAdornerControl displays the back button and a page title -->
<Layout:PageAdornerControl
Background="{StaticResource ApplicationPageBackgroundThemeBrush}"
Header="{Binding Header}">
I see Header as the text. My first thought was to change {Binding Header} to {Binding }, however a mouse over on Header shows that as some valid whatever. Also, I would like to use the Visual Studio 2012 properties window to change the text.

There might be other ways, and I am still less than green with XAML, but here is one way using Nate's pageAdornerControl method.
Place the cursor on the Layout:PageAdornerControl in the XAML code area.
Go to the properties window, which should show the type as PageAdornerControl.
Scroll down to header
From the dropdown list, select Go to Source
You will now see another section of code highlighted.
Go to the properties window and the Header attribute will be the actual header text, which you can edit.

Add behaviour to TextBlock silverlight 3

I want to add a behaviour to a TextBlock in silverlight 3.
I have a behaviour class in a c# file in a different project than my xaml file within my solution.
public class FooBehavior : Behavior<TextBlock>
{
...
}
How do I attach this behaviour to my TextBlock? Would be nice to do without involving c# code.

Include the following lines in the definition of your UserControl:
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:myBehaviors="clr-namespace:MyNamespace.Behaviors;assembly=MyAssembly"
Then on the TextBlock have this code:
<TextBlock .....>
<i:Interaction.Behaviors>
<myBehaviors:FooBehaviour/>
</i:Interaction.Behaviors>
</TextBlock>

ChrisF has the correct answer for how to write the Xaml to add the behavior. However, if you have Blend it is even simpler.
Open your project in Blend
On the tools toolbar click the >> button
Click on Behaviors
Find your Behavior and Drag it over your TextBlock and drop it
Blend will add all the proper namespaces for you.