To add button and a textbox in page editing mode you have two possible approaches:
1. Create a control with the textbox and button, register it in Sitefinity and use it on your pages. Here
is the documentation on creating controls and registering them in Sitefinity.
To add the text of the textbox to treeview you need to implement the logic for this action in the control`s code file.
2. Create a master page that will have textbox and button and use this master page to create sitefinity template. Here
is the documentation on creating templates with master pages.
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