Position of picture at AdvGlowButton

I want to put a column of AdvGlowButton's on a form.

All buttons have same left and size.
All buttons should have a different picture, but all pictures should be adjusted in a column.
To do this, I use for each Button.Layout := blGlyphLeftAdjusted;
Now all glyph's stick on left border of button, but I want to have the glyph's with a litte more distance from the left border.
How can I adjust the distance between left border of the button and the picture? (At TBitBtn component I do this with "Margin" property.)

Currently there is unfortunately not a property to control this. 
We've added this on the feature request list for a future update.