Can I programmatically change properties of selected userform controls when I am designing the form?

ExcelHCFUser 

This can be done by accessing the .Designer property of the selected vbcomponent. Below will move the selected controls a specific direction a number of pixels.

Sub nudgeHor(distanceInPixels As Long)
    Dim ctl    As Control
    For Each ctl In ThisWorkbook.VBProject.VBComponents(Application.VBE.SelectedVBComponent.Name).Designer.Selected
        ctl.Left = ctl.Left + distanceInPixels
    Next ctl
End Sub
Sub nudgeVer(distanceInPixels As Long)
    Dim ctl    As Control
    For Each ctl In ThisWorkbook.VBProject.VBComponents(Application.VBE.SelectedVBComponent.Name).Designer.Selected
        ctl.Top = ctl.Top + distanceInPixels
    Next ctl
End Sub