ComboBox.RightMargin Property (Access)
Along with the TopMargin, Left Margin, and BottomMargin properties, specifies the location of information displayed within a combo 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. 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.