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Is there a specific property to allow Telerik toolwindow to be docked as tab group

I'm using a Telerik ToolWindow and I add to it a WinForms UserControl but when I do that and try to drag the toolwindow, dock hints only show some docking options that don't include the tab group docking.
Dim x = new CustomUserControl()
Dim toolWindow As New ToolWindow
With toolWindow
.Tag = MapControl
.CloseAction = closing
.Controls.Add(MapControl)
.DataBindings.Add(someMethod(MapControl))
End With
desktop.AddDocument(toolWindow)
CustomUserControl inherits UserControl.

I would like to note that ToolWindow is a part of the RadDock control: https://docs.telerik.com/devtools/winforms/controls/dock/overview
It is a specific window that can be dragged and dropped within the RadDock control.
Please refer to the following help articles demonstrating how to setup a RadDock with a ToolWindow at run time:
https://docs.telerik.com/devtools/winforms/controls/dock/object-model/creating-a-raddock-at-runtime
https://docs.telerik.com/devtools/winforms/controls/dock/object-model/creating-toolwindow-and-documentwindow-at-runtime
I hope this information helps.

How to show an ErrorProvider error icon next to a TabPage header?

Edit:
This is not a duplicate of Icons in TabControl C# - How?. The question there is about adding icons to tab pages. Here it is about how the change the error provider error icon position to be inside the header instead of to the right of the tab page itself. Also, the error provider error icon has the functionality that when you hover the mouse on it, you see the error text, which you do not see if you simply add an icon to the header.
I have a form with a TabControl. The form has also an ErrorProvider. When I try to use the following code:
errorProvider1.SetError(tabPage1, "error");
The error icon is shown to the right of the tab page, and it is cut-off by the tab control itself:
I would like the icon to be shown next to the tab page header. Something like this (made with Photoshop):
I do not know where to start, or how to approach this.
Edit:
I have a class responsible for adding errors to a control, and showing them using an error provider. This class is used for TextBoxes, NumericUpDowns etc. I would like to use it also for TabPages. The problem is that when I use it for tab pages I get the result shown above. The trick of adding an error icon to the header using an ImageList and then add a tooltip is not good, because it is specific to tab pages, and I cannot implement it in my class which is general to all controls. So I really need to change the settings of the tab page so when I use errorProvider.SetError(...) it is shown in the header.

ErrorProvider shows error icon of the TabPage in tab page's client area.
By playing with IconAlignment or IconPadding, you can show error icon of TabControl on one of the tab pages' headers, but it's error icon for the whole TabControl.
In a real application each of the tab pages can contain controls which are not valid and you may want to show the validation icon on tab pages not for the tab control.
My suggestion is using tab page icon by setting ImageList containing the error icon as image list of the TabControl and by setting ImageIndex of the TabPage, show or hide the image icon. This way you can show the error icon for every tab page which needs it:
Example
To setup the example, follow these steps:
Create a Form.
Drop a TabControl, an ErrorProvider and an ImageList on the Form.
Set ImageList property of tabControl1 to imageList1.
Drop two TextBox on tabPage1.
I assume, just for example, you are going to validate these two text box controls using Validating event. The key point is here. When you validate any control, check if it's hosted in a TabPage, check validity of all children of TabPage and set the error icon based on that:
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
this.AutoValidate = AutoValidate.EnableAllowFocusChange;
imageList1.ColorDepth = ColorDepth.Depth32Bit;
imageList1.Images.Add(errorProvider1.Icon);
tabControl1.ImageList = imageList1;
textBox1.Validating += textBox_Validating;
textBox2.Validating += textBox_Validating;
}
private void textBox_Validating(object sender, CancelEventArgs e)
{
var textBox = (TextBox)sender;
if (string.IsNullOrEmpty(textBox.Text))
{
this.errorProvider1.SetError(textBox, "Value is required.");
e.Cancel = true;
}
else
this.errorProvider1.SetError(textBox, null);
var tabPage = textBox.Parent as TabPage;
if (tabPage != null)
ValidateTabPage(tabPage);
}
void ValidateTabPage(TabPage tabPage)
{
var tabIsValid = tabPage.Controls.Cast<Control>()
.All(x => string.IsNullOrEmpty(errorProvider1.GetError(x)));
if (tabIsValid)
tabPage.ImageIndex = -1;
else
tabPage.ImageIndex = 0;
}

You can do the following.
Rectangle rc = tabControl1.GetTabRect(0); // Replace with the index of Tab required
errorProvider1.SetIconPadding(tabControl1, -rc.Left-20);;
errorProvider1.SetError(tabControl1, "Error String");
You also need to set
errorProvider1.SetIconAlignment(tabControl1, ErrorIconAlignment.TopLeft);
Sample (With Second Tab Selected - based on comments),
You would need to prepend whitespace to your TabPage Text to ensure there is sufficient space for showing the icon
With Icon on Second Tab

How do I add a textblock dynamically to a page?

I'm just learning how to make universal apps for windows 10. Most of the tutorials show you how to work with XAML and how to assign functions to elements when you click on them but I couldn't find a way to make a new control appear when I click a button.
I'm making a note taking application. I've designed most of the stuff that I need. Now I want whenever I click a button to create a new textblock where the user can write their note.
//Create a new note when clicking the add button
private void newNoteBtn_Click(object sender, RoutedEventArgs e)
{
TextBox newNote = new TextBox();
newNote.Text = "Enter your text";
}
This is the code that runs when the button is clicked. When I run the application nothing happens. I think I have to put the new textbox in some kind of Grid or something.
Most of the tutorials are really old or mention windows forms and use some sort of this.Controls.Add(newNote); but Visual studio doesn't give me the Controls.Add option. I've also created a <Grid x:Name="notes"></Grid> which I thought I could use as a placeholder for the notes that are being created but I can't access the Grid element through the code.

Container Controls like Grid have Children property so you should use Childern like this:
TextBox newNote = new TextBox();
newNote.Text = "Enter your text";
notes.Childern.Add(newNote);

When defining
<Grid x:Name="notes"></Grid>
in XAML on the page, you be able to use notes as the identifier to access this Grid from the page's code behind:
notes.Children.Add(newNote);

Adding panel to Appointment/calendar item window in outlook

OBJECTIVE:
C# .Net VSTO2010
i need to add a panel to appointment/calendar item window in outlook.
AppointmentItem window means window which opens when we click an appointment or create new appointment in outlook.
I need to display to some details(appoitnmentitem related) in appointmentItem Window (i prefer to use panel).
Actually i am displaying some details (addin related details) in separate tab as form in appointment item window, i want to display those details in single window(appointmentitem window) of appointmentItem
Inspector :Represents the window in which an Outlook item is displayed.
but in Inspector there is no support for adding panel
I am able to add panel or custom task pane in outlook main window .but i am not able to do in appointmentitem window.
I am using .Net 4 framework ,visual studio 2010. This has to be done in a outlook Addin, addin is target for MS office outlook 2003,2007,2010(atleast it should support 2007and 2010).
adding panel to outlook main window can be done using window handle and window class , then using function in User32.dll. but same technique i am not able to use on appointmentitem window.( i am not able to get handle of appointment item window)
adding custom task pane to outlook main window can be done using some code but i didnt find functionality to do it on appointment item window.
looking for good help or suggestions

You Can Add the side panel through the Custom Task panes and New Inspector Event Handler.
Step 1:
private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
inspectors = this.Application.Inspectors;
inspectors.NewInspector +=
new Microsoft.Office.Interop.Outlook.InspectorsEvents_NewInspectorEventHandler(NewInspectorHandler);
}
Step 2:
public void Inspectors_NewInspector(Microsoft.Office.Interop.Outlook.Inspector Inspector)
{
Microsoft.Office.Tools.CustomTaskPane myCustomTaskPane;
if(Inspector.CurrentItem is Microsoft.Office.Interop.Outlook.AppointmentItem ) {
UserControl uc1 = MyUserControl();
myCustomTaskPane = getAddIn().CustomTaskPanes.Add(uc1, "MyPanel",Inspector);
myCustomTaskPane.DockPosition = Office.MsoCTPDockPosition.msoCTPDockPositionRight;
myCustomTaskPane.DockPositionRestrict = Office.MsoCTPDockPositionRestrict.msoCTPDockPositionRestrictNoChange;
myCustomTaskPane.Visible = true;
}
//Additionally You can add a property change listener to the current Item here
}
This will show the Custom side panel in Appointment Item

WPF: adding a usercontrol to a window

First off, I'm new to WPF and C# so maybe the issue I have is really easy to fix. But I'm kinda stuck at the moment.
Let me explain my problem.
I have a WPF Window and two usercontrols (Controls and ContentDisplayer).
The usercontrol Controls, wich contains some buttons, is added in the XAML of the Window.
Nothing special here.
Window.XAML
<nv:Controls/>
Now, what I want to do is when a user is pressing a button in Controls, ContentDisplayer needs to be added to the Scatterview I have in my Window.
I solved the problem by adding the buttons to the Window, and not using the usercontrol Controls. But this is not what I want.
Window.XAML.CS
private static void Button_ContactChanged(object sender, ContactEventArgs e)
{
object ob = Application.LoadComponent(new Uri(
"NVApril;component\\XAML\\ContentDisplayer.xaml",
System.UriKind.RelativeOrAbsolute));
//Set a unique name to the UserControl
string name = String.Format("userControl{0}",
SurfaceWindow1_Scatterview.Items.Count);
UserControl userControl = ob as UserControl;
userControl.Name = name;
//Add the new control to the Scatterview
SurfaceWindow1_Scatterview.Items.Add(userControl);
SurfaceWindow1_Scatterview.RegisterName(name, userControl);
}
So the real question is: How do I add a usercontrol to the Window by pressing a button in an other usercontrol?
Thanks,
Toner

At the top of the window xaml add
xmlns:d="clr-namespace:SomeNamespace.Usercontrols"
where you these exist already, you can choose the namespace of your control from the intellesence list.
Then where you want to place the control type:
<d:yourusercontrolhere params />
and your usercontrols can be added there.

Within Controls expose an event that is fired when you want to add a new control.
public event EventHandler AddControl;
private void RaiseAddControl()
{
if (AddControl!= null)
{
AddControl(this, EventArgs.Empty);
}
}
Now sink that event in your Window
yourControl.AddControl += ContactChanged

In your window, it sounds like you need to add the event to the instances of Controls.
<local:ContentDisplayer>
...
<nv:Controls AddControl="ContactChanged"/>
...
Then in your ContactChanged event handler you can instantiate a new Controls control and add it to whatever collection you're using like in your Button_ContactChanged event handler above.
Let me know if you need further clarification.

I have no idea what you are trying to do your example,
So you have a control defined thus:
public partial class somecontrolname : UserControl
With your corresponding Xaml file
All you need to do to add it in code to your window is firstly you need a LayoutRoot such as Grid control in the window then just
[mylayoutcontrol].Children.Add(new somecontrolname());
Maybe I got wrong idea what you are trying to do, your example code doesn't make much sense to me, looks like you are trying to load the xaml source file