# Methods

The `ColumnGroup` class provides several methods to manipulate a column group in the grid.

#### `setColumns(array $columns)`

This method sets the columns of the group. It takes one argument: an array of `BaseColumn` instances.

```php
public function setColumns(array $columns): static
```

#### `addColumn(BaseColumn $column)`

This method adds a column to the group. It takes one argument: a `BaseColumn` instance.

```php
public function addColumn(BaseColumn $column): static
```

###

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