# DM_SET3STATE

The DM_SET3STATE message is sent to the dialog manager to change the style of a DI_CHECKBOX item.

### Param1

The ID of the dialog item that you want to change.

### Param2

- TRUE - the check box can have 3 states
- FALSE - the check box can have only 2 states.

### Return

Previous style of the item.

### Controls

Control | Description
--- | ---
DI_CHECKBOX | Check Box

### Remarks

### Example

See also:
DialogEx | DM_GETCHECK | DM_SETCHECK.