This article explains the fluid design capabilities RadEditor offers. The example below shows how you can set its size in percent so it can resize with its parent element and refresh it when needed.
Generally, responsive design means that the page and its content are able to adapt to different screen resolutions without deteriorating the user experience. This often includes changing the font size and having dimensions set in percent.
You can set the Width and Height properties of the RadEditor in percent. This lets it resize together with its parent element. The control has no way of knowing its parent size has changed, however,so the developer needs to invoke the
repaint() client-side method of the map so it can recalculate its elements (toolbar, modules etc.). You can find a small sample in Example 1.