How to add undo redo functionality in the editor toolbar?

[saran13raj]

Hi.
I've added 2 buttons in the toolbar for undo and redo. So it acts the same as ctrl+z and ctrl+shift+z in mac.
But not clear how to add functionality for undo and redo in the execute property.
What I need is to call a function that changes the state of the EditorContext without invoking the keyboard shortcuts

[saran13raj]

I added undo/redo functionality by document.execCommand('undo', false, null).
Even though execCommand is deprecated there's no other alternative at this moment.