如何创建一个进度/消息窗口，其中每一行可以是不同的字体，大小，颜色？

I tried to make a TextBlock in my View that will display whatever message I send to it. It just keeps appending a new line each time it writes. I want the ability to write in different font, size, and color per line. I tried to make a TextBlock in my View that wil