Hello, Ahmed,     

In order to add an extra button in the title bar I would recommend you to have a look at the following forum thread which demonstrates a sample code snippet how to achieve it: https://www.telerik.com/forums/how-to-properly-add-a-radbuttonelement-in-a-radform-titlebar

I hope this information helps. If you have any additional questions, please let me know. 

Regards,
Dess
Progress Telerik

I don't know how to thank you ^_^.

May I be able to apply this code using radtextbox?

C#

 

Hello, Ahmed,     

The following help article demonstrates how to add a button element in RadTextBox: https://docs.telerik.com/devtools/winforms/editors/textbox/adding-buttons-to-radtextbox

I hope this information helps. If you have any additional questions, please let me know. 

Regards,
Dess
Progress Telerik

I'm sorry but you misunderstood my question!

What I wanted to say is how to add a radtextbox to the caption bar of the form in c#

 

Hello, Ahmed,     

Please excuse me for the misunderstanding but it was not clear enough according to the provided information. RadTextBox/RadTextBoxControl are input controls. They can't be added to the non-client area of the form which is the title bar. The focus won't be passed to the text box. The possible solution that I can suggest is to use a ShapedForm with a RadTitleBar. Then, add a RadTextBox/RadTextBoxControl to the RadTitleBar at design time. 

I hope this information helps. If you have any additional questions, please let me know. 

Regards,
Dess
Progress Telerik