How do I add elements to the header of a TabbedForm?

Hello, Serg,   

Please have a look at the following help article to get familiar with the structure of RadTabbedForm: https://docs.telerik.com/devtools/winforms/controls/forms-and-dialogs/tabbedform/structure 

The Left/Right QuickAccessToolBar actually represents the Left/RightItems.

This is how you can add items at design time:

Please refer to the following help article which is quite useful about adding items to the both quick access toolbars either at design time or at run time.

I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik

Hello, Serg,

Please accept my sincere apologies for the missed second link in my previous reply. Here it is: https://docs.telerik.com/devtools/winforms/controls/forms-and-dialogs/tabbedform/features/quick-actions 

The "Add Items at Run-Time" section demonstrates how to add button elements to the left/right quick access toolbar: https://docs.telerik.com/devtools/winforms/controls/forms-and-dialogs/tabbedform/features/quick-actions#add-items-at-run-time 

Should you have further questions please let me know.

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik

Hello, Serg,

According to the provided picture, it seems that you do not want the overflow button from the quick access toolbar. In order to hide it please refer to the following code snippet:

this.TabbedFormControl.LeftItems.Add(new RadButtonElement { Text = "button1" });
RadQuickAccessToolBar toolbar = this.radTabbedFormControl1.TabbedFormControlElement.Children[3] as RadQuickAccessToolBar;
toolbar.OverflowButtonElement.Visibility = ElementVisibility.Collapsed;

I hope this helps. If you have further questions please let me know.

Regards,
Nadya
Progress Telerik

Thank you! it really helped me! How is it possible to change the color and style of this panel?

I tried to change color this way:
 

But not a single line works. The color is still blue. I want to change the color and completely remove all padding, so that only the button is visible, and there are no borders or indents.

Hello, Serg,

Following the provided information it seems that you would like to change the color of the panel that hosts the buttons. In this case, you should access the TabbedFormControlElement.CaptionFill:

 this.TabbedFormControl.TabbedFormControlElement.CaptionFill.BackColor = Color.Yellow;
 this.TabbedFormControl.TabbedFormControlElement.CaptionFill.GradientStyle = GradientStyles.Solid;

I hope this helps. Let me know if you have other questions.

Regards,
Nadya
Progress Telerik