refactor: add override column key methods

Author: paodb

enhanced-grid-flow/src/main/java/com/vaadin/componentfactory/enhancedgrid/EnhancedColumn.java

@@ -280,4 +280,13 @@ public String addEnhancedGridSorter(String templateInnerHtml) {
                 "<enhanced-grid-sorter path='%s'" + sortable + filtered +">%s</enhanced-grid-sorter>",
                 escapedColumnId, templateInnerHtml);
 	}
+	
+	/**
+	 * @see Column#setKey(String)
+	 * 
+	 */
+	@Override
+	public EnhancedColumn<T> setKey(String key) {
+		return (EnhancedColumn<T>) super.setKey(key);
+	}
 }

enhanced-grid-flow/src/main/java/com/vaadin/componentfactory/enhancedgrid/EnhancedGrid.java

@@ -447,6 +447,10 @@ public <V extends Component> EnhancedColumn<T> addComponentColumn(ValueProvider<
 	public EnhancedColumn<T> getColumnByKey(String columnKey) {
 		return (EnhancedColumn<T>) super.getColumnByKey(columnKey);
 	}
+
+	protected void setColumnKey(String key, EnhancedColumn<T> column) {
+		super.setColumnKey(key, column);
+	}
 
 	@Override
 	public void onApplyFilter(Object filter) {