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How to set checkstate of particular item in repositoryItemCheckedComboBoxEdit which is bound to datasource?
// Add check items to the control's dropdown.
string[] itemValues = new string[] {
    "Circle", "Rectangle", "Ellipse",
    "Triangle", "Square" };
foreach (string value in itemValues)
    checkedComboBoxEdit1.Properties.Items.Add(value, CheckState.Unchecked, true);
// Specify the separator character.
checkedComboBoxEdit1.Properties.SeparatorChar = ';';
// Set the edit value.
checkedComboBoxEdit1.SetEditValue("Circle; Ellipse");
// Disable the Circle item.
checkedComboBoxEdit1.Properties.Items["Circle"].Enabled = false;