wraps the selection in the provided tag / execCommand function. Should only be called in WYSIWYG mode.
function(command, opt, isSelectableElementTool){
						if(command.toLowerCase() === "undo"){
							scope['$undoTaBindtaTextElement' + _serial]();
						}else if(command.toLowerCase() === "redo"){
							scope['$redoTaBindtaTextElement' + _serial]();
						}else{
							// catch errors like FF erroring when you try to force an undo with nothing done
							_taExecCommand(command, false, opt);
							if(isSelectableElementTool){
								// re-apply the selectable tool events
								scope['reApplyOnSelectorHandlerstaTextElement' + _serial]();
							}
							// refocus on the shown display element, this fixes a display bug when using :focus styles to outline the box.
							// You still have focus on the text/html input it just doesn't show up
							scope.displayElements.text[0].focus();
							return scope.displayElements.text[0];
						}
					}