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Button not showing up in run as in preview

so i have a button whos XAML is as follows:
<Grid>
<!--MoreCode -->
<Button x:Name="Camera2" Grid.Column="2" Grid.Row="7">
<Grid>
<Image Source="images\tabNormal.png"></Image>
<Image Source="images\OfflineRed_21x76.png" Height="18"
VerticalAlignment="Bottom" Margin="0,0,0,5"></Image>
<TextBlock HorizontalAlignment="Center" Text="Camera 2"
VerticalAlignment="Center"/>
</Grid>
</Button>
<!--MoreCode -->
</Grid>
and it Previews ok.
But when i Run the project I get this:
In the end I will end up making this button a standard control, but i want to understand why it does not seem to build right when I run.

in Closing, the problem seemed to be something with the compiler not referencing the images properly (perhaps because I added the images folder to the project after building everything?), the solution was to add the full path to the images i.e. C:\...folders...\images\filename.png as opposed to the initial images\filename.png once this was done once for one file all files in that folder are readable and you can return to a relitive location. Everything seems to be working fine now even after deleting and re adding the files/folder

Getting CefSharp to correctly handle PDF files in WPF

This problem does not impact WinForms.
I have downloaded the bare minimum example from the github site:
https://github.com/cefsharp/CefSharp.MinimalExample
As far as I am reasonably aware everything is up-to-date - I have used NuGet to make sure the latest CefSharp.Common, CefSharp.Wpf etc have been installed - currently version 53.
When I use it to browse web pages it's fine. The problem is when I attempt to view a PDF-based page eg:
http://www.cbu.edu.zm/downloads/pdf-sample.pdf
So in the MainWindow.xaml I bind the 'Address' property to this value instead of "www.google.com":
<Window x:Class="CefSharp.MinimalExample.Wpf.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:wpf="clr-namespace:CefSharp.Wpf;assembly=CefSharp.Wpf"
Title="{Binding Path=Title, ElementName=Browser, Converter={StaticResource TitleConverter}}"
WindowState="Maximized">
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<wpf:ChromiumWebBrowser Grid.Row="0"
x:Name="Browser"
Address="http://www.cbu.edu.zm/downloads/pdf-sample.pdf" />
<StatusBar Grid.Row="1">
<ProgressBar HorizontalAlignment="Right"
IsIndeterminate="{Binding IsLoading, ElementName=Browser}"
Width="100"
Height="16"
Margin="3" />
<Separator />
<!-- TODO: Could show hover link URL here -->
<TextBlock Text="{Binding Address, ElementName=Browser}"/>
</StatusBar>
</Grid>
When I run the example, in order to navigate to this PDF, the screen remains blank and the progress control does not update:
... unless I do something like un-maximise the browser window, or move it etc, then I can view it:
After this there is another strange problem whereby the scrollbars and +/- buttons appear to be unresponsive. I notice that if I do press the '+' button for example and then another action such as maximize/restore - then the intended '+' action appears to have been carried out. Ditto the scrollbar and other actions.
It does not exhibit this behaviour for the WinForms minimal example, if this helps, only the Wpf.
Any suggestions greatly appreciated.

This has been raised as a duplicate of issue #1799 over at the GitHub site:
WPF/OffScreen PDF Viewer not working #1799
Until Version 55 is released, the solution as stated on the site is:
"Suggested workaround is to call Invalidate() on a timer as proposed on ceforum
You can roll back to 51 and use disable-surfaces or wait for version 55 to be released."
I found that rolling back to a previous version worked for me.
UPDATE 21 Jan 2019
This is no longer an issue with the more recent versions of CefSharp.

Choosing Layout Control for WPF Item

I am trying to learn WPF.. Although, Im having trouble with the layouts and which one to choose. I dont want to use canvas because the whole point is the get the hang of WPF..
I have decided to transfer one of my simple programs (in Windows Forms) to WPF..
I have attached the picture of the simple, 1 page form.. Can someone suggest how I could replicate this in WPF?

Form layouts are an interesting predicament. They usually involve a LOT of boilerplate, there's many techniques for removing boilerplate code in form layouts but they're fairly advanced WPF Concepts.
The Simplest Solution for you is going to be a StackPanel for laying out your sections and putting a Grid inside your GroupBox controls.
The Grid can be setup with 4 colunms:
Col 1 Label
Col 1 Body
Col 2 Label
Col 2 Body
With a global style in the resources of your stack panel you can define default visual behaviour so the items dont end up touching:
<Style TargetType="TextBox">
<Setter Property="Margin" "0,0,5,5" />
</Style>
The Above Style will put a 5px margin on the right & bottom of all TextBox controls under it in the visual tree.
This is the absolute simplest (read: straight forward) approach to making this ui in WPF. It is by no means the best, or the most maintainable, but it should be doable in about 10 minutes max.
There are other methods out there for emulating a form layout with WPF like this one or by using other combinations of basic layout components.
For example:
<StackPanel>
<!-- Vertical Stack Panel, Stacks Elements on top of each other -->
<StackPanel Orientation="Horizontal">
<!-- Horizontal Stack Panel, Stacks Elements left to right -->
<Label Width="100">This Label is 100units Wide</Label>
<TextBox />
</StackPanel>
</StackPanel>
Different approaches have different drawbacks, some are flex width, some are not, some play nicely with colunms, some don't. I'd suggest experimenting with the many subclasses of Panel to see what they all do, or you can even roll your own.

Using Grid as container, TextBlock al read-only text, Textbox as editable text and Button.
With these elements and using (for example) XAML:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
x:Class="MainWindow"
Width="640" Height="480" Background="White">
<Grid>
<TextBlock HorizontalAlignment="Left" Height="20" Margin="34,30,0,0"
TextWrapping="Wrap" Text="Connection String" VerticalAlignment="Top"
Width="107" Foreground="Black"/>
<TextBox HorizontalAlignment="Left" Height="18" Margin="170,32,0,0"
TextWrapping="Wrap" VerticalAlignment="Top" Width="379"/>
<Button Content="Save" HorizontalAlignment="Left" Height="26"
Margin="529,387,0,0" VerticalAlignment="Top" Width="69"/>
</Grid>
you can put all objects in your Window. But if you prefer you can add the elements programmatically. This is the result:
Here an introduction to WPF layout.

Focus on Canvas overlapping the listbox in WP7

I have a situation here. I have a page containing a ListBox. The ListBox is populated with Items if it is able to fetch the data from a web service. Now when the user doesn't have network connectivity on his phone or the webservice doesn't respond back with Ok status, I want to show the user a pop-up with an option to Retry or select Ok to stay on the same page (though it sounds dumb). Now for this I used a Canvas:
<Canvas Name="Nonetwork" Height="150" Width="280" HorizontalAlignment="Center" VerticalAlignment="Center" Background="DodgerBlue" Visibility="Collapsed" Margin="111,160,92,160" >
<TextBlock VerticalAlignment="Top" Height="120" Width="280" Text="No Network is currently availabe" TextAlignment="Center" TextWrapping="Wrap" Foreground="White" FontSize="28" />
<Button Margin="30, 80" Height="60" Width="100" Content="OK" FontSize="18" Click="Ok_Click"/>
<Button Margin="150, 80" Height="60" Width="100" Content="Retry" FontSize="18" Click="Retry_Click"/>
</Canvas>
Well as most of you experienced guys would have guessed, the canvas is buried inside the listbox and is not accessible when there is no network connectivity. So I have a blank page with the canvas but the user is not able to click on Ok or Retry. Please help
Please do let me know if there is any other approach to solve this problem. I tried Popup but I cant Navigate to the main page from a pop-up since that is a user control page. Any help is higly appreciated

Well, I placed my Canvas below the ListBox and the problem was solved. I didn't know that positioning of the controls in the XAML would have so much effect ...

The order in which elements are rendered in Silverlight is determined firstly by where they appear in the visual object hierarchy and secondly by their ZIndex property.
The Canvas has a third attached property named ZIndex that you can use to override the default layering of elements. Although this Canvas.ZIndex attached property is defined by the Canvas class, it actually works with any type of panel.
You can also try Canvas.ZIndex property:
Canvas.ZIndex Attached Property

What you do is a wrong practice and not at all recommended.
ChildWindow is the class you should use to display such kind of dialog.
Using a Popup is also another approach you can use.
NOTE: I know the simplest approach would be to use MessageBox.Show(), but it would create a popup out of silverlight frame and does not allow theming/styling and other customizations.

WPF Design question

Lets say i am developing a chat, first you come to a login window and when your logged in i want to use the same window but chaning the control :P how would be the best way to desight this?
is there any good way to implement this what root element should i use?
Thanks a lot!!

Take a look at Josh Smith's article in MSDN magazine (http://msdn.microsoft.com/en-us/magazine/dd419663.aspx). He describes an interesting method where you have a content presenter on your main window use data templates to switch out what the window is showing.

If you want to do this all within the same window, you could use a Grid as the root element and host a login element (possibly another grid for layout) and the chat window. These elements would stack on top of one another, depending upon the order in which you declare them. To hide the chat element initially, set its Visibility to Collapsed
You could then have the login element's Visibility set to Collapsed when the user submits their login details, and have the chat element's Visibility set to Visible.
I did something similar once and it worked well for me.
Hope that helps.
EDIT I knocked this together in Kaxaml for you to play with (and because I like playing with XAML):
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
<Border x:Name="_loginForm" BorderBrush="#888" BorderThickness="3" CornerRadius="5"
HorizontalAlignment="Center" VerticalAlignment="Center" Padding="10" Visibility="Visible">
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" HorizontalAlignment="Center" Height="30">Welcome to chat</TextBlock>
<TextBlock Grid.Row="1" Grid.Column="0">User Name</TextBlock>
<TextBox Grid.Row="1" Grid.Column="1" x:Name="_userName" />
<TextBlock Grid.Row="2" Grid.Column="0">Password</TextBlock>
<TextBox Grid.Row="2" Grid.Column="1" x:Name="_password"></TextBox>
<Button Grid.Row="3" Grid.Column="1">Log In</Button>
</Grid>
</Border>
<DockPanel x:Name="_chatForm" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" LastChildFill="True" Visibility="Collapsed">
<DockPanel DockPanel.Dock="Bottom" LastChildFill="True" Height="70">
<Button DockPanel.Dock="Right" Width="70">_Send</Button>
<TextBox x:Name="_input" HorizontalAlignment="Stretch">Hello world</TextBox>
</DockPanel>
<ListBox x:Name="_messageHistory" />
</DockPanel>
</Grid>
</Page>
Initially the element _loginForm is visible. You'd attach a handler for the Log In button's Click event that would hide it, and show the _chatForm instead.
This example shows usage of several layout controls -- the Grid, DockPanel and StackPanel.

Alternatively, you can use a StackPanel for your layout. As a simple example, you can have 2 elements in your panel; a custom login control as well as the chat 'display' control. After successfully logging in, remove the custom login control from your stack so only the chat is visible.

It's WPF! Animate them in and out of view...you can do that now. There's a collaborative project on Google Code called Witty (a desktop Twitter client written in WPF), and they do something really cool that you might want to borrow from. Come to think of it, there's another WPF Twitter client (blu) that does similar animations that you might want to look at.
In Witty, the Settings dialog is a normal window, but when you switch between the tabs, a storyboard slides the part of the window you requested into view. I haven't debugged the app at this level, but I'm assuming that they have a horizontal StackPanel populated with containers that are fixed to the height and width of the dialog, and they slide them in and out with a storyboard.
Take a look at both of these apps for ideas. You may want to do something similar, but being that this is a WPF app, the sky is really the limit.
Witty
blu

There are already some answers here on, how to swap two elements at the view level. This post offers a way to more fundamentally create a modular application design with interchangeable views.
You could take a look at the Composite Application Library. It is a small library (developed by Microsoft) that among other things aid in making your application more modular. With this you can define regions of your GUI, that can have interchangeable views.
In your containing xaml import the CAL namespace and use RegionManager to define a region:
<Window ...
xmlns:cal="http://www.codeplex.com/CompositeWPF"
...>
...
<ItemsControl cal:RegionManager.RegionName="MyRegion" />
...
Then you can swap views in this region, preferably in a module:
_regionManager.Regions["MyRegion"].Add(new LoginView());
...swap...
_regionManager.Regions["MyRegion"].Add(new ChatView());
This is of course just an outline of what you can do. In order to implement this solution, you will have to look further in to CAL. It has great documentation and lots of examples to learn from.

I think a more intuitive solution is to use a Frame control as the base control of your window - and to use the NavigateService to change the source of the Frame to different Page controls (which could be defined in separate assemblies, or in your same project as different XAML files).
Your Window:
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Frame Source="LogonPage.xaml" NavigationUIVisibility="Hidden" />
</Window>
And your separate LogonPage:
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Logon">
<!-- Your content of the page goes here... -->
</Page>