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wpf loading a gif image animation

I wanted to do a simple button_click that would load an animated gif and have it loop 3 times.
The closest example which is not a Winform example, is Mediaelement, but how does one load it within the button click?
Can one point me to a tutorial?
<MediaElement Height="113"
HorizontalAlignment="Left"
Name="mediaElement1"
Width="177" Source="giffy.gif"
LoadedBehavior="Play"
Stretch="Fill" SpeedRatio="1" IsMuted="False" />

I have used this one and it is easily installed via the Nuget installer into the project.
Nuget WpfAnimatedGif
Their github page WPF Animated GIF specifies how to set it to loop x number of times.

Moving Control over a ScrollViewer

I'm developing a small WPF application which uses a ScrollViewer to show an Image in a Window.
I have generated the window and all his relative code (I will show it if needed but I think is not usefull for the point of this question) programmatically.
The question/ how to is the following. I have to show/hide (pressing a button) a control (basically a InkCanvas) over the image contained in the ScrollViewer. Except the part oh show/hide is pretty simple to use the button event) which is the best way to add a control (and which type of control/container) at the Window forcing him to be over the ScrollViewer and then be able to move around dragging it?
I'm relatively new to WPF I used a lot of WinForms (I can do this in WinForms but WPF is a new world for me).
Thanks in advance!

As for the container you should use a Grid which will center and put on top of each other the controls in a same cell.
As for drag and drop if you want to implement it yourself I've provided a minimal implementation here: https://stackoverflow.com/a/17014906/145757
Otherwise you can use the MouseDragElementBehavior behavior provided by Blend.
Here is a tutorial that demonstrates its usage from Blend itself: http://www.c-sharpcorner.com/uploadfile/nipuntomar/expression-blend-4-behaviors/
But you can use it without Blend by importing the Blend libraries and using it from your XAML with something like:
<InkCanvas ...>
<interactivity:Interaction.Behaviors>
<blendbehaviors:MouseDragElementBehavior />
</interactivity:Interaction.Behaviors>
</InkCanvas>
with interactivity and blendbehaviors being mapped to the Blend namespaces.

panorama control with scroll

I'm really new to programming but decided I will start learning c# development for windows phone 8. I know they have a button control in the toolbox but I am looking to make the kind of buttons you see on the start screen for the phone. No idea how.
Also I would love to know how to use the panorama control and how to incorporate the buttons asks previously to have an image and put into a verticals scroll layout, separated by panorama items of course. Please note as I said before I'm super new and don't know much yet.

To make start screen buttons alike (a.k.a tiles) take a look here. Download the examples and look under HubTile.
Now for the second part of your question all you need is a panorama page with a WrapPanelthat can also be found in the toolkit mentioned earlier.
So what you should be doing is adding a WrapPanel inside the PanoramaItem, and then the HubTiles inside the wrap panel. Here is an example:
<controls:PanoramaItem Header="hubtiles">
<Grid>
<toolkit:WrapPanel Orientation="Horizontal">
<toolkit:HubTile/> <!-- Change accordingly -->
</toolkit:WrapPanel>
</Grid>
</controls:PanoramaItem>

WebBrowser as Canvas Background

I like to add a WebBrowser control as a Canvas background in WPF using C#. How do I do this? I have the following code at the moment. But does not work.
<Canvas
Name="canvas"
Grid.ColumnSpan="4"
Grid.Row="1"
MouseDown="Canvas_MouseDown"
MouseMove="Canvas_MouseMove"
MouseUp="Canvas_MouseUp"
Margin="0,0,0,16"
Grid.RowSpan="3">
<Canvas.Background>
<VisualBrush>
<VisualBrush.Visual>
<WebBrowser
x:Name="wbMain"
Height="246"
Width="592" />
</VisualBrush.Visual>
</VisualBrush>
</Canvas.Background>
</Canvas>

You cannot do this. The web browser control is an Internet Explorer ActiveX wrapper with the resulting airspace issues.
However, you can draw on top of it using the <Popup> control or if you don't mind losing the interactivity, try generating an image of the web page and use it as the Canvas background.
If you are thinking about using the WPF Chrome wrapper by Chris Cavanagh, bear in mind:
It does not yet support COM-Visible (so no window.external javascript methods back to your C# code)
It has a dependency on Awesomium which is only free for non-commercial use.
It will add over 10MB to your code size as it needs to embed Chromium

The WebBrowser control isn't a standard WPF control as far as I'm aware. It's basically an embedded window with an IE control in it. I'm fairly certain you can't use it in this manner.

It's an embedded IE window, so you can't use it that way.
You CAN, however, use the chrome one that way: http://chriscavanagh.wordpress.com/2009/08/25/a-real-wpf-webbrowser/
You can also map it to a surface, animate it etc.

WPF: InkCanvas + Frame

I need to draw over the html page. Page displayed in a Frame element.
The problem is that InkCanvas does not work with Frame.
I tried to insert TextBlock instead of Frame - painting works.
Does not work:
<Frame Grid.Row="1" Source="http://google.com/"></Frame>
<InkCanvas Grid.Row="1" x:Name="inkCanvas" Background="Transparent"></InkCanvas>
Work:
<TextBlock Grid.Row="1" Margin="10" Text="Some text"></TextBlock>
<InkCanvas Grid.Row="1" x:Name="inkCanvas" Background="Transparent"></InkCanvas>

When the Frame control navigates to HTML content, the Frame control internally instantiates the native WebBrowser ActiveX control. This involves HWND interop. As a result of that the "airspace proplem" comes into play. It basically means that no WPF content can overlap that AcitveX HWND. You can partly work around this propblem by wrapping the overlay into another HWND (e.g. using Winfows Forms and ElementHost). But this solution will not allow you to have transparency in the overlay.
Another trick you could try is to use the WindowsFormsHost to host the Windows Forms Browser Control instead of using a Frame.
Last but not least you could use the Chromium WPF Webbrowser Control instead of the Frame control if you can afford it. It is based on the Awesomium library. Which unfortunately is only free for non commercial use. This is the only solution that allows you to use all the advanced WPF goodies like transformation (rotation, skew etc.), bitmapeffects or transparency etc. Width the other two solutions you are bound to a fixed opaque rectangle.