To increase the height of the dropdown box, try this code.
Code:
Private Declare Function MoveWindow _
Lib "user32" (ByVal hwnd As Long, ByVal x As Long, _
ByVal y As Long, ByVal nWidth As Long, ByVal nHeight _
As Long, ByVal bRepaint As Long) As Long
Private Sub SetComboHeight(oComboBox As ComboBox, _
lNewHeight As Long)
Dim oldscalemode As Integer
' This procedure does not work with frames: you
' cannot set the ScaleMode to vbPixels, because
' the frame does not have a ScaleMode Property.
' To get round this, you could set the parent control
' to be the form while you run this procedure.
If TypeOf oComboBox.Parent Is Frame Then Exit Sub
' Change the ScaleMode on the parent to Pixels.
oldscalemode = oComboBox.Parent.ScaleMode
oComboBox.Parent.ScaleMode = vbPixels
' Resize the combo box window.
MoveWindow oComboBox.hwnd, oComboBox.Left, _
oComboBox.Top, oComboBox.Width, lNewHeight, 1
' Replace the old ScaleMode
oComboBox.Parent.ScaleMode = oldscalemode
End Sub
Usage
Private Sub Form_Load()
Call SetComboHeight(Combo1, 1450)
End Sub