This way ?
VB Code:
Option Explicit
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 Form_Load()
SetDropHeight Combo1, 300
End Sub
Public Sub SetDropHeight(cbo As ComboBox, lngHeight As Long)
Dim intScaleMode As Integer
'Store the current scalemode
intScaleMode = cbo.Parent.ScaleMode
'Set it to pixels
cbo.Parent.ScaleMode = vbPixels
'Move the check box
MoveWindow cbo.hwnd, cbo.Left, cbo.Top, cbo.Width, lngHeight, 1
'Reset the scalemode
cbo.Parent.ScaleMode = intScaleMode
End Sub