ComboBox.TopMargin Property (Access)
Along with the LeftMargin, RightMargin, and BottomMargin properties, specifies the location of information displayed within a text box control. Read/write Integer.
A control's displayed information location is measured from the control's left, top, right, or bottom border to the left, top, right, or bottom edge of the displayed information. Setting the LeftMargin or TopMargin property to 0 places the displayed information's edge at the very left or top of the control. To use a unit of measurement different from the setting in the regional settings of Windows, specify the unit (for example, cm or in).
In Visual Basic, use a numeric expression to set the value of this property. Values are expressed in twips.