I used to use the color rgb=236, 233, 216 as a background. The program used to recognize that as transparent. When they installed the "dark" theme, something changed and that color no longer works.
You can use the Button Editor to create an icon, though it's a PITA 'cause it's so small and one can't zoom. When you first open the dialog, the foreground is completely white and the Background is transparent (has a checkerboard look). Activate the "eye dropper" tool and click in the transparent Background box. Select the "Flood Fill" tool and click in the "Picture" field. The white should be replaced by a checkerboard, denoting that it's transparent. Now you can select a tool (pixel, line, rectangle, circle), then a color and then create an icon. Where it's completely transparent, the button background for the Theme being used should show in those areas. I do notice in the "dark" theme that the background goes black instead of the gradient shade. You can also select the Eye Dropper & transparent, then use one of the drawing tools to basically "erase" whatever you want in the foreground.
Edit: The "Copy" option in the "Tools" area doesn't work, but "Copy Button Image" (Local Menu) does.
If you place a toolbar containing my Delete icon above the drawing area (Menus, Standard & Property toolbars area), the background will show. An icon created in the Button Editor is transparent anyplace.
A downside to custom icons, they don't appear in the Tools palette; just a blank space.
« Last Edit: December 09, 2013, 09:52:28 AM by John R »
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Windows 10 Pro (1803), 64-bit