Currently, the HyperlinkClicked event of RadWorksheetEditor is raised only for external hyperlinks (web and mailto addresses). Raise the event also for links pointing to the a cell in the same document.

Add the CellIndex or CellRange of the clicked cell in the HyperlinkClicked event arguments (HyperlinkClickedEventArgs).

Check how the performance can be improved in this scenario. The StyleGallery is taking much time to load, the GetUsedCellRange method is called multiple times.

Returns a Range object that represents the current region. The current region is a range bounded by any combination of blank rows and blank columns. If we want to be consistent with MS Excel we should implement this property. It is useful for many operations of a region such as filtering(selecting one cell and executing the Filter command should apply it to the current region), sorting, selecting all and etc. This document will be useful: https://docs.microsoft.com/en-us/office/vba/api/excel.range.currentregion.