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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

C# wpf web control

is any way to open a web browser(visible?) in specific browser and do action like clic button, search etc. i try
WebBrowser web = new WebBrowser();
web.Navigate(new Uri("https://www.google.com/"));
but i didnt see it. I too know i can do something like that
System.Diagnostics.Process.Start("chrome.exe","http://www.google.com");
but how then make action there control it? Or the only way is open browse in wpf and show it on some king of window.

The best place to actually start learning how to utilize the different Class Controls at our disposal from the .NET environment is reading their documentation!
WebBrowserClass
They show a relative simple example of how to achieve what you want, with the creation of the webbrowser in XAML. In this XAML, they define a TextBox so you can introduce your absolute path, but also a button to perform the search when you click on it.
<Grid x:Name="MainGrid">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
<TextBox x:Name="addressTextBox" Width="200" />
<Button Click="Button_Click">Go</Button>
</StackPanel>
<WebBrowser Grid.Row="1" x:Name="myWebBrowser" />
</Grid>
I changed the XAML part a bit, so you don't have your WebBrowser with limited Height and instead have it occupied most of the screen real estate.
PS. In all honesty i cannot pinpoint why your code-behind implementation on the WebBrowser is not working though.

How to program several sizes of screens in uwp?

Hi i am Developing a app on universal windows 10 app platform, and when i put some Objects on the XAML window and when change the screen size it's stay how it was before so it's fit the new screen size and if i fix it it's fit the old screen size and i need the app to be universal.
my xaml code:
<Page
x:Class="App17.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App17"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Loaded="Grid_Loaded">
<Grid.Background>
<ImageBrush Stretch="UniformToFill" ImageSource="Assets/backPHONE.jpg"/>
</Grid.Background>
<Grid.RowDefinitions>
<RowDefinition Height="55*"/>
<RowDefinition Height="9*"/>
</Grid.RowDefinitions>
<RelativePanel>
<TextBlock x:Name="textBlock" HorizontalAlignment="Left" Margin="41,155,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="128" Width="360" Text="test 123" FontFamily="Century Gothic" FontStretch="UltraExpanded" FontStyle="Italic" FontSize="26" Tapped="textBlock_Tapped" TextAlignment="Center"/>
<ComboBox x:Name="comboBox" HorizontalAlignment="Left" Margin="84,700,0,-666.8" VerticalAlignment="Top" Width="264" SelectionChanged="comboBox_SelectionChanged" Height="32" Grid.Row="1">
<ComboBoxItem Content="test" IsSelected="True"/>
</ComboBox>
<TextBlock x:Name="textBlock2" HorizontalAlignment="Left" Margin="164,675,-2.8,-665" TextWrapping="Wrap" Text="test" VerticalAlignment="Top" Height="20" Width="120" Grid.Row="1" SelectionHighlightColor="#FFF10000" FontFamily="Century Gothic" FontSize="12" FontStretch="UltraExpanded" FontStyle="Italic" Foreground="White"/>
</RelativePanel>
</Grid>
thanks

Let me introduce two possible ways to handle various screen sizes related with Universal Windows 10 Apps.
1. Adaptive Triggers - you can use them to adjut your layout to different device families - for instance you can define how your Page will look on the smartphone and while app is launched on the PC. Below I tried to add some short instructions how you can start using them.
a) When you have Visual Studio opened, please right click on the MainPage.xaml and select "Design in Blend...":
b) Go to "States" tab and select icon (marked red rectangle below) called "Add state group":
c) Now you have to add state, so click the icon next to "Visual State Group" as show below:
d) Now add two state: "Mobile" and "Desktop" as shown below:
e) Last step is to set minimum window width to detect when screen size is changed:
f) Now you are able to set minimum window width for the "Mobile" state:
Please type 320 as below (remember that these are effective pixels not physical)
Once you click "OK" Visual State for "Mobile" will be configured.
Do the same above steps but for "Desktop" state and type 1024 for minimum window width:
Now I can switch between two states and adjust the design for each of them:
(Note that currently selected state is marked with red rectange):
1. Device-Family Folders - you can specify two separate views for Pages but with one code behind. This can help if you have to craft your design specially for mobile devices and for instance fot the PCs.
a) Right click on the project and add new falder called "DeviveFamily-Mobile":
b) Add new Xaml View called the same like your previous page - in my case this is "MainPage":
c) Now you have one code behind class but two separate views that will be applied accordingly to device family:
I hope that it will help you to start.
You can also watch very good Channel9 video or visit my blog where I am trying to present a lot of helpful samples related with UWP.

you must use AdaptiveTriggers
http://www.wintellect.com/devcenter/jprosise/using-adaptivetrigger-to-build-adaptive-uis-in-windows-10

Pivot overlapping other elements in WP 8.1 Universal app (and automatically changing margin)

The following XAML shows the content of a Windows Phone 8.1 Universal app page. The idea is to have a bar on top of a pivot. But the pivot is overlapping the bar whereas the sample grid in blue is working as expected.
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="50" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid Background="{StaticResource PhoneAccentBrush}" Height="50" />
<Pivot Grid.Row="1" Background="Green" Width="200" HorizontalAlignment="Left" />
<Grid Grid.Row="1" Background="Blue" Width="200" HorizontalAlignment="Right" />
</Grid>
The resulting Page looks like this:
Where is this "negative margin" coming from?
How can it be avoided?
BTW: Just setting a margin is not a solution as it introduces other problems, for example a jumping GUI when using a SemanticZoom control, I need to know the root cause of the problem to solve it...
Info: It seems that the Windows Phone Pivot automatically changes the margin depending on the current screen settings (status bar shown/hidden). So if your app changes the state of the status bar in some circumstances you will end up having a jumping/changing pivot control.

I've found a solution and created a simple attached property for the Pivot control.
The attached property can be used this way:
<Pivot controls:PivotExtensions.DisableAutoMargin="True">
<PivotItem Header="A">
...
</PivotItem>
<PivotItem Header="B">
...
</PivotItem>
</Pivot>
The class with the attached property can be found here:
http://mytoolkit.codeplex.com/SourceControl/latest#MyToolkit.Extended.WinRT/Controls/PivotExtensions.cs
Downside: You cannot override the template anymore as the attached property changes the template already...

Overriding the control template doesn't seem to work; there is some code in the control that's setting the margin after construction. Also setting the Margin on the offending grid on the Loaded event doesn't work either, the negative margin code runs after that.
The only way I found to make the odd behavior go away was to ask your UI to overlap the status bar:
ApplicationView.GetForCurrentView()
.SetDesiredBoundsMode(ApplicationViewBoundsMode.UseCoreWindow);
Then the Pivot control figures that it doesn't need to try and cover the status bar. Note that you'll now have to give room in your page layout to prevent overlap with the status bar.

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>