Inserts tabulator in the position of caret.
function InsertTab: Boolean;
(introduced in v1.9)
This method always inserts a tabulator, regardless of RVStyle.SpacesInTab mode.
Method type: editing-style method for insertion.
True if the insertion was successful (it can fail due to protection, or when inserting in table having multicell selection)
See also method of TRichView: