declare namespace Ext {
    export namespace grid {
        export interface ColumnManagerConfig {
        }

        export class ColumnManager extends Ext.Base  {
            public getFirst(): Ext.grid.column.Column;
            public getHeaderAtIndex(index?: number): Ext.grid.column.Column;
            public getHeaderByDataIndex(dataIndex?: string): Ext.grid.column.Column;
            public getHeaderById(id?: string): Ext.grid.column.Column;
            public getHeaderIndex(header?: Ext.grid.column.Column): number;
            public getLast(): Ext.grid.column.Column;
            public getVisibleHeaderClosestToIndex(index?: number): void;
        }
    }
}