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How do I make controls extend passed a control bound or overlap with others?

I have a wpf grid setup where I have two custom buttons that are next to each other. First picture is how the design window looks like, however, functionally, it looks like the second picture. I want them to function like the grid doesn't block them (closely resembling the first picture.)
The current xml I have is based on this MSDM which is very basic.
I do not know how to proceed. Do I have to use a different control panel/container or is there a setting to allowed them to extend passed the grid if the other button isn't above it (like zpanel?)
E: I couldn't find any other questions for this, so please link to any searches/posts with information on it.

Turns out I can use canvas and just do a bit more xml to keep the design the same. I would still like to know if it is possible to overlap them in any way for future use.

WPF Control Identification

Sorry but I am a newbie to WPF, I would really appreciate if you could help me-
Tag 1 in pic- Which control can I use to create a menu similar to that in the picture ? The closest I came was using a gridview within a listview but that ends up using a header for the gridview. Normal listview just highlights the entire strip and doesn't look good at all.
Tag 2 in pic // (No longer relevant, sorry)
Edit:
Looking for something simple like when using gridview with listview (as in pic below) there is automatically that standard window gradient & bevel effect etc. (As an idea, implementing it with buttons seems to cumbersome, first strip button border, then create all these effects.) So essentially anything already inbuilt in WPF.
Thanks for any help :-D !!!

ListBox or ListView are good controls to use. If it's just the 'pretty' factor you don't like, you can provide Templates to change the appearance. But functionally, ListBox and ListView provide the function of that menu.
When working with WPF, that should be your primary motivation when choose controls. What FUNCTIONS the way you want. You can always make it LOOK different with Templates, but getting the right FUNCTION is the primary goal for the control.

ListView with TreeViewItems in xaml

I'm pretty new to c#, the first thing that I'm trying to make is a ListView with data bindings which has turned out ok.
I'm now trying to make items have a twist button if the underlying model has any children (like the TreeView). Each of the children will have columns the same as all the top level items.
How would I go about doing this? Is there an already existing control like this? If not would I be better off dressing up a TreeView to look like a ListView, or dress up a ListView to look like a TreeView?
I went down the road outlined in this solution which dresses up a TreeView, but the end result looks pretty awful and the heading is actually just an item, so you lose all the nice column sizing and column buttons that can hook up to column sorting that you get in ListView so that route actually seems like it would be more work.
I noticed the new task manager has a control exactly like what I'm trying to create, I don't know how this made? probably in C though.

Microsoft provides a sample that appears to be what you are looking for. A write-up of the example can be found here:
http://msdn.microsoft.com/en-us/library/vstudio/ms771523(v=vs.90).aspx
When you build and run the example you will end up with something resembling this:
There is a large amount of templating done in the example, so you will be able to make things look the way you want.

What you describe sounds a bit like a TreeListView, and if you google 'WPF TreeListView' you will see some solutions that might be good for you. I have used one from Telerik, but it might be overkill depending on how complicated your needs are.
If you only want one sub-level like the image you attached, you might want to just roll your own using a ListView with a complex DataTemplate for the first column which would show an expander button and a simple ListBox bound to the children items.
Similar to the answer here, except your cell would have a checkbox styled to look like the arrow, the text for the item, and a child ListBox. Then bind the visibility of the child ListBox to the state of the checkbox.

Create a custom Data Grid from Silverlight

I'm watching at this page:
http://leeontech.wordpress.com/2010/02/01/summary-row-in-datagrid/
But they're using silverlight. I'm trying to create that user control to use it in a WPF C# application. I mean, not using Silverlight. But I can't find the namespaces: GroupHeader
I'm having a hard time with this. Thanks in advance.

Okay listen, you can totally do this, and in some scenarios I even recommend it.
Using a CollectionViewSource you can easily group your data. In the HeaderTemplate you can even use an Expander (or make your own) and get the animation you might be wanting. Here's a link to a sample of this: http://jerrytech.blogspot.com/2010/06/wpf-data-presentation-step-by-step.html
Using an ItemsControl, you can easily present your groups and details. In the ItemTemplate you can use styles make this look like a grid (if that is really what you want). You can also shift the style based on the type if your collection has more than one type of object in it (eat that datagrid!).
You can wire up your column headers (which will really be custom objects, right?) and handle all the sorting and stuff like that. They will look just right! Not like datagrid WinForm column headers!
Here's what's hard (not impossible, but more coding).
User-resizable columns.
User-rearrangable columns.
New record using bottom, empty row.
Paste from Excel (doesn't work right in datagrid either).
Select Row, highlight Column header.
That's it.
In lots of situations, this is really nice.
For the most part, I cannot stand the datagrid. Too restricting on UX.

I don't think you're not going to be able to get a silverlight control working in WPF.
Adding a footer row to the WPF datagrid is something a lot of people have complained about; it's ridiculous that it wasn't included out of the box.
See this thread from MSDN
Having been through this myself, your best bet will probably be to bite the bullet and use a third party control. It sucks, I know.

Silverlight simple binding / dependancy property

I've just started developing in Silverlight, and I have a calendar control which shows details for each day.
The text within the calendar is held within lots of textblocks, for some browsers the text size might be too big, so I want to have a slider control on the 'usercontrol' which allows the user to adjust the font size.
I'm building the calendar through c# code, so my question is.. what is the best way to 'wire' this up. I'm guessing it would be one of these options.
Add an event to the slider control for ValueChanged, then iterate through all TextBlocks setting the fontsize to the new size. This seems long-winded.
Maybe using a 'Style', which is attached to each TextBlock, then just changing the FontSize of the 'Style'.. ?? maybe ?
Using 'binding' & 'Dependancy Property'. I've looked into this, and it seems to be the way to do it, but I can't find an example where you're passing a value from one control to multiple other ones. Maybe I'm missing something.
I can do option 1 quite easily, but I want to learn about alternative methods of doing this.
Thanks
Rich.

A way to handle this is to not use fixed sizes but to size everything to its content. that way the control will get bigger when a larger font size is selected. Just like the TextBlock.

I've actually got this working now using option 3 which I'm happy with, it was very simple, but there seemed to be little documentation on it (maybe I was searching for the wrong thing).
It was as simple as adding a few lines...
Binding bind = new Binding("Value");
bind.Source = FontSlider;
The for every control that I want to apply the FontSlider's 'Value' to.. I do this...
MyTextBlock.SetBinding(TextBlock.FontSizeProperty,bind);
Simples.
Cheers
Rich.