In order to prevent other users from modifying a component, you can check out a component.
Checking Out a Component
To check out a selected component, select the component you want to check out and click the Check Out button, or in the right-click menu select Check Out.
Undoing Checking Out a Component
To undo a check-out of a component, select the component and click the Undo Check Out button, or in the right-click menu select Undo Check Out.