"Select all warp gates" - button for other units?

[Kabel]

There is a neat little icon down in the right corner for the Protoss player to easily select all warp gates.

How can I make more buttons like that to indicate other units?

Example

In my custom map, the queen has a special role. She can lay eggs on the ground. I want it easy for the player playing the Queen to find all eggs.

Player A plays as the Queen. After playing a couple of minutes, he has placed totally 26 eggs on the map. To select them all, he clicks the neat little icon down right, which indicates 26 eggs. All the eggs gets selected, and he morphs them into units. The button now shows 0 eggs.

 

[Dr Super Good]

Yeh I am also having problem finding this at the moment. It is unit wide as well since it links all Warp Gates to the same button with W hotkey as a group.