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How to limit focus to a Control in WPF

I Have a Page Containing some controls, this page will be loaded into a ContentControl in a Window.
Now, How can i limit the focus cycle in my Page? I don't want to pass the focus to out of Page after pressing TAB in last item of my page.
As a brief, How Can I determine the next focus control and change it

It's always difficult to fully understand what a question author wants when they don't bother to provide you with more than a few hastily typed lines. However, as far as I understand your problem, it seems that you have some problem with focusing in your WPF Application.
The first thing to do is to direct you to the Focus Overview page on MSDN, where you can find out about the different focus types used in WPF. In particular, please pay attention to the Navigating Focus Programmatically section which discusses the TraversalRequest Class that can help developers to move focus programmatically.
You should also pay careful attention to the KeyboardNavigation section that discusses the KeyboardNavigation Class. This class contains some properties that enable you to define how the Tab key works in various scenarios, so this may be what you're after. It is used like this (from the last linked page on MSDN):
KeyboardNavigation.SetTabNavigation(navigationMenu, KeyboardNavigationMode.Cycle);
For future reference, you will get quicker and more accurate answers if you provide clear questions that include all of your requirements at the time of posting.

Have you tried looking at the FocusLost event - you might possibly be able to just refocus the page control with an event handler.
private void Page_LostFocus(object sender, System.Windows.RoutedEventArgs e)
{
((UIElement)sender).Focus();
}

count any keystrokes whether or not Window (App) is in focus - WPF

I'm building a "WPF Application" which is made to be run in the background (minimised state) and detects KeyStrokes of each and Every key on the keyboard & every Mouse Clicks.
So, my question is how to detect every keyStrokes whether app (Window) is minimised or not.
Simply, if my app is in focus then i use this code to count keystrokes.
Public int count;
protected override void OnKeyDown(System.Windows.Input.KeyEventArgs e)
{
//base.OnKeyDown(e);
count++;
tBlockCount.Text = count.ToString();
}
I just want to do the same even if my app is minimised.
I've searched a lot and come across many suggestions like..
http://www.pinvoke.net/default.aspx/user32/registerhotkey.html
http://social.msdn.microsoft.com/Forums/vstudio/en-US/87d66b1c-330c-42fe-8a40-81f82012575c/background-hotkeys-wpf?forum=wpf
Detecting input keystroke during WPF processing
Detect if any key is pressed in C# (not A, B, but any)
Most of those are indicating towards Registering HotKeys. But I'm unable to match scenario with mine.
Any kind of suggestion are most welcome.

Although I'm not really condoning the use of a keylogger (This is what you are trying to do). I would recommend taking a look at this q/a, the section near the bottom of this article, and this article for some inspiration. These should help point in the right direction for the coding side.
What you essentially need to do is just set up an event to intercept any keys that come in from the computer, then you can gather the key and do whatever you like with it (in your case, record it)
Edit: In fact, reading the third article, it actually gives a full code snippet on how to implement and use it in WPF, so I recommend just reading that one.

How to manipulate a control without any pattern implemented?

I'm trying to implement the automation test via UIAutomation for our project. But lots of the controls are not standrad, and proper patterns are also not implemented for that controls. How should I to manipulate the controls via UIAutomation framework in this case?
For example, a button in our product is implemented via a Pane, and the invoked pattern is not implemented as well. How should I click the button? (To avoid installing VS on the test machine, I don't want to use Mouse.Click() in Microsoft.VisiualStudio.TestTools.UITesting namespace) Is there a way to do that only using UIAutomation framework or something else embedded in .net framework? Thanks in advance! (If the proper pattern is implemented, Below code will work. And as a new user, I cannot post the screenshot for your reference, sorry!)
object temp = null;
if (btnTest.TryGetCurrentPattern(InvokePattern.Pattern, out temp))
{
InvokePattern btnTestPattern = temp as InvokePattern;
btnTestPattern.Invoke();
}

The only way to interact when Control Patterns are not implemented is to go clicking around stuff.
I would suggest try following to avoid maximum errors.
Before sending the click, make sure the parent of button(pane or window is set to foreground)
Instead of sending the click to corner of the AutomationElement, try sending it in midpoint, of the element,
Also, try hovering over the element first, the wait like 200ms, and then send click, So that you are sure to see execution.[Trust me, this helps debugging a lot and avoids many issues.]

The best thing would be, if those guys who implement the system would implement server-side UIA provider to their UI Elements!
But often that's not possible..., I used the following workaround (at least for clicking/toggling):
AutomationElement yourAE = ...// some code to find the right AutomationElement (AE)
clickablePoint = yourAE.GetClickablePoint();
also BoundingRectangleProperty could be of help
If you receive that clickable point you can use
System.Windows.Forms.Cursor.Position = new System.Drawing.Point((int)clickablePoint.X, (int)clickablePoint.Y);
to move to the location, and than click it via InputSimulator or some win32 (user32.dll) commands.
(note: of course you can also use InputSimulator or win32 to move the mouse - but I had some problems with the InputSimulator when it came to several screens with different locations or resolutions - so Cursor.Position was the easiest approach, which is also very reliable)

C# Label Properties won't update upon resize

I recently started getting acquainted with Visual Studio 2010 and C# for an internship. C# doesn't include a built-in InputBox function, so I made my own form, with a text box, two buttons and a simple label.
I have a function set up to allow the programmer to call the form in regular format (where the user enters input via the textbox) or yes/no format (where the form just displays a question and the yes and no buttons).
When I switch over to yes/no format, I want to center the label programmatically. I've been using the code:
labelNote.Left = inputBox.Left + (inputBox.Width / 2) - (labelNote.Width / 2);
This should put the center of the note in the center of the form. However, if the contents of the label change (making the new label longer or shorter) the properties don't update to reflect the new size. It won't center unless it includes the original text. Is there some way to force an update? I foresee this becoming a problem with positioning objects for scalability in the future.
Thank you for your time

I'm assuming you have the sizing within an actionlistener. Specifically the forms' resize action listener. Then whenever the form is resized it is called and all of you code is recalled. Then to force an update from somewhere else you just have to call the actionlistener.
Actionlistener:
Private Sub formName_Resize(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Resize
Calls actionlistener:
formName_Resize(sender, e)

Well, you could attach an event to Label.TextChanged. Frankly it would be better to change the TextAlign or something like that though: try to perform the layout in a declarative fashion instead of doing it explicitly through code. That tends to make things work rather better.
I've found the [TableLayoutPanel]1 control to be reasonably easy to work with - most of the time (and occasionally a complete pain).

It turns out that I made a stupid mistake (a common theme for me in debugging. The really small stuff goes unnoticed for the longest amount of time).
The label resizing was not the issue. The issue was the order in which I changed the contents of the label and then called the function to calculate its new location. I was calling the location calculation first, so it found where to center the label based on the old contents. I didn't notice for so long, because the text was changing properly. I took it for granted that the functions were being called in the correct order.
So, when it doubt, check the order in which you're writing your code. Thanks for you help anyway, everyone. I ended up finding out some neat things that could be applicable to other scenarios (such as the MeasureString function in the Graphics class).

.Net C# Design View errors

I have subclassed a Treeview and on instantiation it loads a new ImageList (and the associated Images).
Whenever I switch to the designer view, it's also trying to run this code, however the images aren't in the designer's path, so it crashes. I ended up putting in a hack to see if the current directory is "Visual Studio", then do nothing... but that's so ugly.
I find this happening for other things. If a control is trying to use objects during load/initalization that are only available while the program is running, then the Design View cannot bring up the control.
But is there a way to get around this?
I guess what I'm hoping for is having a try/catch for the Designer (only) with the ability to ignore a few errors I know will be happening (like FileNotFoundException, etc.).
Thanks

Everything that inherits from System.Windows.Forms.Control has a DesignMode property that returns a boolean indicating if you are in design mode or not. You could use this to determine when to/when not to load external resources.

Usually it is better to move the loading of these resources to an override of OnLoad as they are rarely required directly at construction. This fixes the issue you are seeing and means that only trees which get displayed at least once will perform these additional resource loading steps.
Otherwise, you can just exclude these steps during design time by checking the DesignMode property and acting accordingly.

This is a fine pattern to use if you're making a control library with a sample of images when shown in the designer or hook ins to other designer features but as a pattern for development I'm not sure it's very effective.
I would suggest shifting your "business logic" (in this case your loading of certain images into a treeview) outside of the bounds of your treeview control. In your case I would place the logic within the Load event of the form that the control is inside:
public void Load(object sender, EventArgs e)
{
string path = "c:\somePath\toAwesome\Images";
myFunkyTreeView.AddImages(path);
}
For larger apps I personally think you want to shift the logic even out of the forms themselves, but this is debatable measure as it requires additional plumbing as a trade-off for the flexibility this provides.

Thanks for pointing me in the right directioon guys.
I had tried registering to the OnLoad event, but that event is triggered when the Design View comes up, so that didn't quite work for me (am I doing something wrong?).
Anyway, I looked a bit more into the DesignMode property. It can only work for Controls, and sometimes your object may not even be a control.
So here's the answer I prefer:
if (LicenseManager.UsageMode == LicenseUsageMode.Designtime) {
// design-time stuff
} else {
// run-time stuff
}
Found it here.