diff --git a/src-es6/extensions/colsVisibility/colsVisibility.js b/src-es6/extensions/colsVisibility/colsVisibility.js
index 065fa2fb..b984a9c4 100644
--- a/src-es6/extensions/colsVisibility/colsVisibility.js
+++ b/src-es6/extensions/colsVisibility/colsVisibility.js
@@ -1,3 +1,5 @@
+import {Dom} from 'dom';
+import {Types} from 'types';
 
 export class ColsVisibility{
 
@@ -23,36 +25,134 @@ export class ColsVisibility{
         this.showHideColsContEl = null;
 
         //tick to hide or show column
-        this.showHideColsTickToHide = Boolean(
-            f.showHide_cols_tick_to_hide || true);
+        this.showHideColsTickToHide = Boolean(f.colvis_tick_to_hide || true);
         //enables/disables cols manager generation
-        this.showHideColsManager = Boolean(f.showHide_cols_manager || true);
+        this.showHideColsManager = Boolean(f.colvis_manager || true);
         //only if external headers
-        this.showHideColsHeadersTbl = f.showHide_cols_headers_table || null;
+        this.showHideColsHeadersTbl = f.colvis_headers_table || null;
         //only if external headers
-        this.showHideColsHeadersIndex = f.showHide_cols_headers_index || 1;
+        this.showHideColsHeadersIndex = f.colvis_headers_index || 1;
         //id of container element
-        this.showHideColsContElTgtId =
-            f.showHide_cols_container_target_id || null;
+        this.showHideColsContElTgtId = f.colvis_container_target_id || null;
         //alternative headers text
-        this.showHideColsHeadersText = f.showHide_cols_headers_text || null;
+        this.showHideColsHeadersText = f.colvis_headers_text || null;
         //id of button container element
-        this.btnShowHideColsTgtId = f.btn_showHide_cols_target_id || null;
+        this.btnShowHideColsTgtId = f.btn_colvis_target_id || null;
         //defines show/hide cols text
-        this.btnShowHideColsText = f.btn_showHide_cols_text ||
+        this.btnShowHideColsText = f.btn_colvis_text ||
             'Display columns▼';
             //defines show/hide cols button innerHtml
-        this.btnShowHideColsHtml = f.btn_showHide_cols_html || null;
+        this.btnShowHideColsHtml = f.btn_colvis_html || null;
         //defines css class for show/hide cols button
-        this.btnShowHideColsCssClass = f.btn_showHide_cols_css_class ||
-            'showHideCols';
+        this.btnShowHideColsCssClass = f.btn_colvis_css_class || 'showHideCols';
         //defines close link text
-        this.btnShowHideColsCloseText = f.btn_showHide_cols_close_text ||
-            'Close';
+        this.btnShowHideColsCloseText = f.btn_colvis_close_text || 'Close';
         //defines close button innerHtml
-        this.btnShowHideColsCloseHtml = f.btn_showHide_cols_close_html || null;
+        this.btnShowHideColsCloseHtml = f.btn_colvis_close_html || null;
         //defines css class for close button
         this.btnShowHideColsCloseCssClass =
-            f.btn_showHide_cols_close_css_class || this.btnShowHideColsCssClass;
+            f.btn_colvis_close_css_class || this.btnShowHideColsCssClass;
+
+        this.showHideColsExtPath = ext.path || 'TFExt_ColsVisibility/';
+        this.showHideColsStylesheet = 'TFExt_ColsVisibility.css';
+        //span containing show/hide cols button
+        this.prfxShowHideColsSpan = 'showHideCols_';
+        //defines css class span containing show/hide cols
+        this.showHideColsSpanCss =  f.colvis_span_css_class ||
+            'showHideColsSpan';
+        this.prfxShowHideColsCont = 'showHideColsCont_';
+        //defines css class div containing show/hide cols
+        this.showHideColsContCss = f.colvis_cont_css_class ||
+            'showHideColsCont';
+        //defines css class for cols list (ul)
+        this.showHideColsListCss = f.colvis_list_css_class ||'cols_checklist';
+        //defines css class for list item (li)
+        this.showHideColsListItemCssClass = f.checklist_item_css_class ||
+            'cols_checklist_item';
+        //defines css class for selected list item (li)
+        this.showHideColsListSlcItemCssClass =
+            f.checklist_selected_item_css_class || 'cols_checklist_slc_item';
+        //text preceding columns list
+        this.showHideColsText = f.colvis_text || 'Hide columns: ';
+        this.showHideColsAtStart = f.colvis_at_start || null;
+        this.showHideColsEnableHover = Boolean(f.colvis_enable_hover) || false;
+        //enables select all option
+        this.showHideEnableTickAll = Boolean(f.colvis_enable_tick_all) ||
+            false;
+        //text preceding columns list
+        this.showHideTickAllText = f.colvis_tick_all_text || 'Select all:';
+        this.showHideColsIsOpen = false;
+        //array containing hidden columns indexes
+        this.showHideHiddenCols = [];
+        this.tblHasColTag = (Dom.tag(tf.tbl,'col').length > 0);
+
+        //callback invoked just after cols manager is loaded
+        this.onColsManagerLoaded = Types.isFn(f.on_cols_manager_loaded) ?
+            f.on_cols_manager_loaded : null;
+        //calls function before cols manager is opened
+        this.onBeforeOpenColsManager =
+            Types.isFn(f.on_before_open_cols_manager) ?
+            f.on_before_open_cols_manager : null;
+        //calls function after cols manager is opened
+        this.onAfterOpenColsManager = Types.isFn(f.on_after_open_cols_manager) ?
+            f.on_after_open_cols_manager : null;
+        //calls function before cols manager is closed
+        this.onBeforeCloseColsManager =
+            Types.isFn(f.on_before_close_cols_manager) ?
+            f.on_before_close_cols_manager : null;
+        //calls function after cols manager is closed
+        this.onAfterCloseColsManager =
+            Types.isFn(f.on_after_close_cols_manager) ?
+            f.on_after_close_cols_manager : null;
+
+        //calls function before col is hidden
+        this.onBeforeColIsHidden = Types.isFn(f.on_before_col_is_hidden) ?
+            f.on_before_col_is_hidden : null;
+        //calls function after col is hidden
+        this.onAfterColIsHidden = Types.isFn(f.on_after_col_is_hidden) ?
+            f.on_after_col_is_hidden : null;
+        //calls function before col is displayed
+        this.onBeforeColIsDisplayed = Types.isFn(f.on_before_col_is_displayed) ?
+            f.on_before_col_is_displayed : null;
+        //calls function after col is displayed
+        this.onAfterColIsDisplayed = Types.isFn(f.on_after_col_is_displayed) ?
+            f.on_after_col_is_displayed : null;
+
+        //Grid layout compatibility
+        if(tf.gridLayout){
+            this.showHideColsHeadersTbl = tf.headTbl; //headers table
+            this.showHideColsHeadersIndex = 0; //headers index
+            this.onAfterColIsDisplayed = function(){};
+            this.onAfterColIsHidden = function(){};
+        }
+
+        //Extension event definition
+        //event name for TF event manager
+        tf.Evt.name.colsvisibility = 'ShowColsVisibility';
+        //event status message
+        tf.msgShowColsVisibility = 'Show/Hide columns';
+        tf.Evt._ShowColsVisibility = function(){ o.ShowColsVisibility(); };
+        //event name for TF event manager
+        tf.Evt.name.checkitem = 'CheckItem';
+        //event status message
+        tf.msgCheckItem = 'Showing/hiding columns';
+        tf.Evt._CheckItem = function(li){ o.CheckItem(li); };
+
+        //Loads extension stylesheet
+        tf.includeFile(
+            ext.name+'Style',
+            this.showHideColsExtPath + this.showHideColsStylesheet,
+            null,
+            'link'
+        );
+
+        //Sets button
+        // if(this.showHideColsManager) o.SetShowHideColsBtn();
+        this.init();
+        this.showHideColsExtLoaded = true;
+    }
+
+    init(){
+
     }
 }