SVG Image color does not change

Hi,

I have two SVG images that I imported into a theme extension. Each one is displayed in a picture box. I try to change the color of both images in the code with:

pictureBox1.ImageSource = @”order_release?color=red”;
pictureBox2.ImageSource = @”administration?color=red”;

Only the image in picture box 1 changes to red, the one in picture box 2 stays the original color. It seems it has something to do with the image itself. Most images I use do work correctly but a few show this behavior.

A sample project is attached.

Thanks for your help and best regards
Rudy