Returns or sets the number of list items in a command bar combo box control that appears above the separator line. Read/write Long.
Note This property is read-only for built-in combo box controls.
Remarks
A ListHeaderCount property value of – 1 indicates that there's no separator line in the combo box control.
Example
This example adds a combo box control to the command bar named "Custom" and then adds two items to the combo box. The example uses the ListHeaderCount property to display a separator line between First Item and Second Item in the combo box. The example also sets the number of line items, the width of the combo box, and an empty default for the combo box.
Set myBar = CommandBars("Custom")
Set myControl = myBar.Controls.Add(Type:=msoControlComboBox)
With myControl
.AddItem Text:="First Item", Index:=1
.AddItem Text:="Second Item", Index:=2
.DropDownLines = 3
.DropDownWidth = 75
.ListHeaderCount = 1
End With