ListBox.CellState
From Real Software Documentation
Method
Used to get or set the state of the cell with the coordinates of Row, Column. Row and Column are zero-based. This assumes that the passed cell is a CheckBox cell. Use the CellType property to set a cell to a CheckBox cell.
CheckedStates Enumeration is an Enum of the CheckBox class.
Example
The CellState method enables you to get or set the value of a tri-state Checkbox cell. Any cell of type TypeCheckbox box can store one of three values: Checked, Unchecked, and Indeterminate.
To set up a cell as TypeCheckbox, use code such as this in the Open event:
Me.CellType(1,0)=ListBox.TypeCheckBox
To change the state of the cell, use the CheckedStates enum of the CheckBox control:
ListBox1.CellState(1,0)=Checkbox.CheckedStates.Indeterminate
The Indeterminate state places a minus sign in the checkbox (Macintosh) or fills in checkbox (Windows and Linux).
