Admin - Side menu current class

[kolorguild]

Hi guys,

In the admin side I have 2 side menu buttons on a new tab I created. When you click on the tab the first function is displayed but the button associated to that function is not highlighted. I want the first button to be highlighted.

For example when you click on the pages tab the first side menu button is highlighted.

I want to do this to my plugin's tab.
Can anyone help me?