Sometimes you need to select a color from your design or other sources to be used in your design
You can do so in Designer.
When you are using brush, objects drawing, background color selection etc.
Click the the Color Palate button, then click the Eyedrop button.
Your cursor will turn into eyedrop crosshair. You can select any where on your desktop, even in a different window, applications on your desktop.
After that you can use this color anywhere on your Design.