The Uniform property returns or specifies a percentage value indicating the level of a uniform transparency. Higher values indicate a greater degree of transparency.
Examples:
The following VBA example sets the transparency of all objects with a uniform transparency to 50%.
Sub Test()
Dim s As Shape
For Each s In ActivePage.Shapes
If s.Transparency.Type = cdrUniformTransparency Then
s.Transparency.Uniform = 50
End If
Next s
End Sub