Disabled Icon on PushButton

Hallo,

I'm trying to use a disabled icon from the ImageManager on a pushbutton, but I can't find a way to do this.

I've loaded all my png-images with transparency in the ImageManager. When I now set the icon-property of the pushbutton to an image-id, I'll get the correct image and the image will be grayed when I disable the pushbutton.

But what I want is the grayed, disabled image, when the pushbutton is still enabled. But when I set the icon-property, I can not specify the disabled image. And when I set the picture-property I get a black background instead of a transparent background of the image.

I hope you can tell me how to solve this problem. One idea I had was to use markup for the pushbutton. But I couldn't find a property for markup-images to use the disabled state of a picture. I can only use the image-id with the source-property.

Thanx a lot.

Michael