Do you know how to create glassy button? There are many ways to create glassy button. The following I will show you the way to make glassy button in Illustrator. Let see the step by step.
1-Creating The Circles
You need to create 3 circles with difference color and put it one over another as you can see in the image as following:
1- First, create a circle and fill it with dark orange.
2- Then Copy (Ctrl + C) and Paste in Front (Ctrl + F). Then scale it down and fill with lighter orange color as you see in the image.
3- Do as step 2 to create third circle (Fill it with yellow color).
2-Apply Gaussian Blur Effect
1- Select the yellow circle, then go to Effect menu > Blur > Gaussian Blur.
2- Drag Radius to 70%, the press Ok.
After applied Gaussian blur, it will look like this.
3-Adding Reflection
1- Use Pen Tool (P) 
to draw a highlight as you see in the following.
2- Copy (Ctrl + C) middle circle and Paste in Front (Ctrl + F). Then, select both the circle and the highlight drawing. Then hold Alt and press Intersect Shape Areas to get highlight.
3- Reduce Opacity to about 36%. Then, you will get the image look like the following.
4-Adding Stop Sign
1- Draw a Rounded Rectangle use 
(Rounded Rectangle Tool)
2- Go to Effect menu > Stylize > Outer Glow (To add shadow)
3- Apply Gradient
Now, you get the glassy button. You can try different color as you prefer. I hope you enjoy this tutorial.
