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How to activate all the parent(i.e. one tab) of a UserControl in WPF

For an error validation mechanism, I've to be able to "navigate" in my application to one specific pane.
Currently I've one "SelectedNode" and tries to focus the control that is bound to this property(basically, I've an AttachedProperty to set the IsFocus, based on the name).
My issue is that sometimes this page contains tabs. And it appears that the control cannot be focused if it's hidden(not in the active tab).
Is there a way from an UserControl to go up in its visual tree to "activate" all his parent?
I cannot just bind the "SelectedIndex" of my tabcontrol in the viewModel, for a lot of reasons:
The UserControl that has the tab has one sub user control for each tab, so the usercontrol doesn't know what is in which usercontrol
Putting such things in the ViewModel is wrong, the ViewModel should not have to know that it's displayed in tabs or all in the same pane
Thanks!

Menu Strip in form with Split container (currently being fixed to either panel) [duplicate]

I've simply added a control to my form and now I can't even see it on the form. But it is still there. How can I find it?

In situations that it is not possible to simply click on design surface and select your control, you can select your control using either of these options:
Document Outline Window
You can open Document Outline Window using menu View → Other Windows → Document Outline Also using Ctrl+Alt+T shortcut.
The Document Outline is most useful when you need to put design focus on controls that are deeply embedded within other controls, or that might be hard to select using a mouse or the TAB key.
View the logical structure of a Form or a UserControl.
Put user input focus on deeply nested controls that may be hard to select on the Form itself or the UserControl itself.
Move controls from one parent to another parent.
Locate controls that may be visually hidden by other controls.
Propertie Window
You can open Propertie Window using menu View → Properties Window Also using F4 shortcut.
You can select the control form the drop-down which contains all controls.

Or use the Document Outline window. You can also drag your controls here if they were accidentally misplaced or if you want to change the order of the docked controls.

Converting a tabitem to a window

Suppose I have a TabControl with some TabItems, each tab Item contains a UserControl.
Is there a way to convert the TabItem to a window when its dragged outside the application window and vice versa?
Just like google chrome except that the window will only contain what was inside the TabItem.
Any ideas on how to achieve this?

If you are using an MVVM pattern, you should be able to do this:
When you drag the tab item out of the tab control, send a command to the VM to which creates a new window, passes the original datasource from the view (the tab item) to the window, then remove the tab item from its parent (the tab control) via a command to the parent VM.

Initialization of tabs in tabControl

I'm using tabControl with many tabs(>10), and each tab has UserContol. But tabs Initialize each control at starting my app. It's making my program too slow. I want to run my userControl only when I click on it. How can I do this?

You should improve your UserControls that they do not do the performance stuff until they get activated/visible. Give them a method Activate which the tabcontrol calls when the tabs becomes the selected tab.
Alternatively you could not add the UserControls to the TabPage content in the designer. Instead create your UserControl when the tab becomes active. But this will make them insivible in the Designer.

You could either have a marker such as IsLoaded and until a tab is selected, not load the controls. When the tab is then selected, if it hasn't already been loaded, you could load the controls and add them at runtime to the tabs Controls.
Or, you could have the controls added but not do anything with them until the tab is selected, and then each tab will do the calculations or whatever and update the correct controls.
It's all about your design.

Add a handler to your UserControl's Load event. Then kick off slow activity in the handler.

can form Contain another form in winforms application?

i want to make one form contain another form ;
For the sake of browsing different sub-forms in the same Parent Form using parent controls .

You can use a TabControl to group different controls together, however if you REALLY need to have a subform, you can use MDI forms.
This is a tabcontrol:
It basically has a groupbox for each individual tab, so you can add and remove as you please.
From the docs for tabcontrol:
A TabControl contains tab pages, which are represented by TabPage
objects that you add through the TabPages property. The order of tab
pages in this collection reflects the order the tabs appear in the
control. The user can change the current TabPage by clicking one of
the tabs in the control.
And MDI:
Multiple-document interface (MDI) applications allow you to display
multiple documents at the same time, with each document displayed in
its own window. MDI applications often have a Window menu item with
submenus for switching between windows or documents.

Solution is to set the parent form property
IsMdiContainer = true ;
and set child forms with
childForm.MdiParent = parentForm;

I believe that you are looking for TabControl in C#. This allows to to browse through different tabs in the same parent form. You may refer to TabControl in C# for more information.
Hope this helps.