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 */
onEventSortColumn : function(oArgs) {
//TODO: support form elements in sortable columns
    var evt = oArgs.event;
    var target = oArgs.target;

    var el = this.getThEl(target) || this.getTdEl(target);
    if(el) {
        var oColumn = this.getColumn(el);
        if(oColumn.sortable) {
            Ev.stopEvent(evt);
            this.sortColumn(oColumn);
        }
    }
    else {
    }
},

/**
 * Overridable custom event handler to select Column.
 *
 * @method onEventSelectColumn
 * @param oArgs.event {HTMLEvent} Event object.
 * @param oArgs.target {HTMLElement} Target element.
 */
onEventSelectColumn : function(oArgs) {
    this.selectColumn(oArgs.target);
},

/**
 * Overridable custom event handler to highlight Column. Accounts for spurious
 * caused-by-child events. 
 *
 * @method onEventHighlightColumn
 * @param oArgs.event {HTMLEvent} Event object.
 * @param oArgs.target {HTMLElement} Target element.
 */
onEventHighlightColumn : function(oArgs) {
    //TODO: filter for all spurious events at a lower level
    if(!Dom.isAncestor(oArgs.target,Ev.getRelatedTarget(oArgs.event))) {
        this.highlightColumn(oArgs.target);
    }
},

/**
 * Overridable custom event handler to unhighlight Column. Accounts for spurious
 * caused-by-child events. 
 *
 * @method onEventUnhighlightColumn
 * @param oArgs.event {HTMLEvent} Event object.
 * @param oArgs.target {HTMLElement} Target element.
 */
onEventUnhighlightColumn : function(oArgs) {
    //TODO: filter for all spurious events at a lower level
    if(!Dom.isAncestor(oArgs.target,Ev.getRelatedTarget(oArgs.event))) {
        this.unhighlightColumn(oArgs.target);
    }
},

/**
 * Overridable custom event handler to manage selection according to desktop paradigm.
 *
 * @method onEventSelectRow
 * @param oArgs.event {HTMLEvent} Event object.
 * @param oArgs.target {HTMLElement} Target element.
 */
onEventSelectRow : function(oArgs) {
    var sMode = this.get("selectionMode");
    if(sMode == "single") {
        this._handleSingleSelectionByMouse(oArgs);
    }
    else {
        this._handleStandardSelectionByMouse(oArgs);
    }
},

/**
 * Overridable custom event handler to select cell.
 *
 * @method onEventSelectCell
 * @param oArgs.event {HTMLEvent} Event object.
 * @param oArgs.target {HTMLElement} Target element.
 */
onEventSelectCell : function(oArgs) {
    var sMode = this.get("selectionMode");
    if(sMode == "cellblock") {
        this._handleCellBlockSelectionByMouse(oArgs);
    }
    else if(sMode == "cellrange") {
        this._handleCellRangeSelectionByMouse(oArgs);
    }
    else {
        this._handleSingleCellSelectionByMouse(oArgs);
    }
},

/**
 * Overridable custom event handler to highlight row. Accounts for spurious
 * caused-by-child events. 
 *
 * @method onEventHighlightRow
 * @param oArgs.event {HTMLEvent} Event object.
 * @param oArgs.target {HTMLElement} Target element.
 */
onEventHighlightRow : function(oArgs) {
    //TODO: filter for all spurious events at a lower level
    if(!Dom.isAncestor(oArgs.target,Ev.getRelatedTarget(oArgs.event))) {
        this.highlightRow(oArgs.target);
    }
},

/**
 * Overridable custom event handler to unhighlight row. Accounts for spurious
 * caused-by-child events. 
 *
 * @method onEventUnhighlightRow
 * @param oArgs.event {HTMLEvent} Event object.
 * @param oArgs.target {HTMLElement} Target element.
 */
onEventUnhighlightRow : function(oArgs) {
    //TODO: filter for all spurious events at a lower level